How are lowercase m and uppercase M used in general chemistry courses? [closed]What does the M in μM-Sux stand for?What does the unit M stand for?How are lowercase k and uppercase K used in general chemistry courses?What does this lambda–sigma notation mean?Should the 'a' in the acid dissociation constant (Ka or pKa) be capitalised?About the way chemicals and molecules are representedDo ALL conversion factors have an infinite number of sigfigs?What is the difference between λ and Λ with regard to molar conductivity?Why do chemistry and physics have different sign convention in thermodynamics?Why is a comma used to separate hydrogen gas and platinum when using cell notation?Atomic mass number and mass number in atomic symbolFor a benzene shown in a skeletal structure, what does a substituent to the center of the ring mean?How are lowercase k and uppercase K used in general chemistry courses?
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How are lowercase m and uppercase M used in general chemistry courses? [closed]
What does the M in μM-Sux stand for?What does the unit M stand for?How are lowercase k and uppercase K used in general chemistry courses?What does this lambda–sigma notation mean?Should the 'a' in the acid dissociation constant (Ka or pKa) be capitalised?About the way chemicals and molecules are representedDo ALL conversion factors have an infinite number of sigfigs?What is the difference between λ and Λ with regard to molar conductivity?Why do chemistry and physics have different sign convention in thermodynamics?Why is a comma used to separate hydrogen gas and platinum when using cell notation?Atomic mass number and mass number in atomic symbolFor a benzene shown in a skeletal structure, what does a substituent to the center of the ring mean?How are lowercase k and uppercase K used in general chemistry courses?
$begingroup$
Where do lowercase m and uppercase M make appearances in general chemistry, and what do they signify?
notation units
asked May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
$endgroup$
closed as too broad by Mithoron, Todd Minehardt, user55119, Tyberius, Nilay Ghosh May 14 at 8:07
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
add a comment |
$begingroup$
Where do lowercase m and uppercase M make appearances in general chemistry, and what do they signify?
notation units
asked May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
$endgroup$
closed as too broad by Mithoron, Todd Minehardt, user55119, Tyberius, Nilay Ghosh May 14 at 8:07
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
5
$begingroup$
What, pray tell, is the point of this question? Every textbook has a table with abbreviations and symbols explained, and anybody who listens to a General Chemistry I or II lecture learns them as he gets on.
$endgroup$
– Karl
May 12 at 21:11
7
$begingroup$
We're not going to have another twenty-five of these, are we?
$endgroup$
– David Richerby
May 12 at 22:32
$begingroup$
@Karl "Everyone who listens to a [...] lecture learns them [...]" - Do you have a reference to support that statement?
$endgroup$
– Karsten Theis
May 13 at 16:50
1
$begingroup$
Related: chemistry.stackexchange.com/questions/115202. In my experience, k and m cause the most confusion, and the related question was closed as too broad. So, @David Richerby, I'm not posing questions on any other roman letters, and I'm not going to get started on greek, either.
$endgroup$
– Karsten Theis
May 13 at 16:54
$begingroup$
No, but stil. I agree that the letter is a bit overused.
$endgroup$
– Karl
May 13 at 19:38
add a comment |
$begingroup$
Where do lowercase m and uppercase M make appearances in general chemistry, and what do they signify?
notation units
asked May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
$endgroup$
Where do lowercase m and uppercase M make appearances in general chemistry, and what do they signify?
notation units
notation units
asked May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
asked May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
edited May 13 at 13:52
Karsten Theis
asked May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
asked May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
asked May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
6,3761048
closed as too broad by Mithoron, Todd Minehardt, user55119, Tyberius, Nilay Ghosh May 14 at 8:07
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
closed as too broad by Mithoron, Todd Minehardt, user55119, Tyberius, Nilay Ghosh May 14 at 8:07
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
5
$begingroup$
What, pray tell, is the point of this question? Every textbook has a table with abbreviations and symbols explained, and anybody who listens to a General Chemistry I or II lecture learns them as he gets on.
$endgroup$
– Karl
May 12 at 21:11
7
$begingroup$
We're not going to have another twenty-five of these, are we?
$endgroup$
– David Richerby
May 12 at 22:32
$begingroup$
@Karl "Everyone who listens to a [...] lecture learns them [...]" - Do you have a reference to support that statement?
$endgroup$
– Karsten Theis
May 13 at 16:50
1
$begingroup$
Related: chemistry.stackexchange.com/questions/115202. In my experience, k and m cause the most confusion, and the related question was closed as too broad. So, @David Richerby, I'm not posing questions on any other roman letters, and I'm not going to get started on greek, either.
$endgroup$
– Karsten Theis
May 13 at 16:54
$begingroup$
No, but stil. I agree that the letter is a bit overused.
$endgroup$
– Karl
May 13 at 19:38
add a comment |
5
$begingroup$
What, pray tell, is the point of this question? Every textbook has a table with abbreviations and symbols explained, and anybody who listens to a General Chemistry I or II lecture learns them as he gets on.
$endgroup$
– Karl
May 12 at 21:11
7
$begingroup$
We're not going to have another twenty-five of these, are we?
$endgroup$
– David Richerby
May 12 at 22:32
$begingroup$
@Karl "Everyone who listens to a [...] lecture learns them [...]" - Do you have a reference to support that statement?
$endgroup$
– Karsten Theis
May 13 at 16:50
1
$begingroup$
Related: chemistry.stackexchange.com/questions/115202. In my experience, k and m cause the most confusion, and the related question was closed as too broad. So, @David Richerby, I'm not posing questions on any other roman letters, and I'm not going to get started on greek, either.
$endgroup$
– Karsten Theis
May 13 at 16:54
$begingroup$
No, but stil. I agree that the letter is a bit overused.
$endgroup$
– Karl
May 13 at 19:38
5
5
$begingroup$
What, pray tell, is the point of this question? Every textbook has a table with abbreviations and symbols explained, and anybody who listens to a General Chemistry I or II lecture learns them as he gets on.
$endgroup$
– Karl
May 12 at 21:11
$begingroup$
What, pray tell, is the point of this question? Every textbook has a table with abbreviations and symbols explained, and anybody who listens to a General Chemistry I or II lecture learns them as he gets on.
$endgroup$
– Karl
May 12 at 21:11
7
7
$begingroup$
We're not going to have another twenty-five of these, are we?
$endgroup$
– David Richerby
May 12 at 22:32
$begingroup$
We're not going to have another twenty-five of these, are we?
$endgroup$
– David Richerby
May 12 at 22:32
$begingroup$
@Karl "Everyone who listens to a [...] lecture learns them [...]" - Do you have a reference to support that statement?
$endgroup$
– Karsten Theis
May 13 at 16:50
$begingroup$
@Karl "Everyone who listens to a [...] lecture learns them [...]" - Do you have a reference to support that statement?
$endgroup$
– Karsten Theis
May 13 at 16:50
1
1
$begingroup$
Related: chemistry.stackexchange.com/questions/115202. In my experience, k and m cause the most confusion, and the related question was closed as too broad. So, @David Richerby, I'm not posing questions on any other roman letters, and I'm not going to get started on greek, either.
$endgroup$
– Karsten Theis
May 13 at 16:54
$begingroup$
Related: chemistry.stackexchange.com/questions/115202. In my experience, k and m cause the most confusion, and the related question was closed as too broad. So, @David Richerby, I'm not posing questions on any other roman letters, and I'm not going to get started on greek, either.
$endgroup$
– Karsten Theis
May 13 at 16:54
$begingroup$
No, but stil. I agree that the letter is a bit overused.
$endgroup$
– Karl
May 13 at 19:38
$begingroup$
No, but stil. I agree that the letter is a bit overused.
$endgroup$
– Karl
May 13 at 19:38
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
Lowercase m
$m$ is the official symbol for the quantity mass.- m is an SI-prefix that stands for milli ($pue-3$), for example in mg (milligram).
$m$ is sometimes uses as the symbol for molality. This is not IUPAC recommended (they recommend $b$) and leads to the confusing definition $$m_textsolute = n_textsolute / m_textsolvent$$ where the first $m$ is for molality and the second one for mass.
Uppercase M
$M$ is used as symbol for the quantity molar mass (dimensions mass per amount of substance).
M is an SI-prefix that stands for mega ($pue6$), for example in MW (megawatts).
M is often used as an abbreviation for mol/L, and mM for mmol/L.
$M$ is sometimes used as a symbol for the quantity molarity (dimensions are amount of substance per volume, official IUPAC name is amount of substance concentration, and official IUPAC symbol is $c$). Textbooks that follow this convention sometimes use MM or ℳ as an alternate symbol for molar mass to avoid name conflicts. Combining the quantity $M$ with the unit M gives silly statements such as: $$M = 5~textM$$
Other useful information
- Make sure your lowercase m and uppercase M look different when you write or type, otherwise you are confusing your readers. If you type, quantities should be italicized and units should not. That also helps to distinguish the different meanings of m.
- You can't cancel m with m if they don't have the same meaning. It is fine to cancel the milli in mg/mL to obtain g/L, but not cancel $m$/mg to obtain 1/g.
edited May 13 at 11:58
orthocresol♦
41.3k7124255
answered May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
$endgroup$
1
$begingroup$
$mathrmM$ is an old (my 1995 textbook already calls it that) abbreviation for mol/L for labelling bottles, like "$mathrm2M$ HCl". It shouldn't be used in equations. The use of $M$ for molarity is really old. Profs still using that should be approached with a garlic bulb in one hand and a colt with a silver bullet in the other.
$endgroup$
– Karl
May 13 at 19:34
$begingroup$
@Karl This is not limited to old textbooks: chat.stackexchange.com/rooms/93601/…
$endgroup$
– Karsten Theis
May 13 at 20:32
$begingroup$
You get what you pay for, and the one you link is not the proverbial exception proving the rule ... Brr. My school textbooks (edition 1992) were better and more modern! They really use amu in an online chemistry textbook? When did they write that, in the late seventies?!? I regularily feel sorry for students from India (and other developing countries) asking questions here, for the outdated *#$& they are taught, but the US?!?
$endgroup$
– Karl
May 14 at 20:27
1
$begingroup$
(sorry for the rant ;-))
$endgroup$
– Karl
May 14 at 20:27
add a comment |
$begingroup$
In addition to the original answer:
Lowercase
m is a symbol for for meta- prefix (locant).- m is a symbol for metastable [isotope].
- m is an abbreviation for "medium" or "multiplet" in spectroscopy.
$pum$ sometimes used in place of $pumi$ for mile, e.g. mph — miles-per-hour.
$m$ is a magnetic quantum number in NMR spectroscopy.
Uppercase
$ceM$ signifies [central] metal (not $ceMe$ — this one is methyl).- M is used to denote mesomeric effect.
- M is a symbol for aminoacid methionine.
M (minus, or Λ) is a left-handed helix in axial chirality.
Small caps
$mathrmsmall M$ is used for concentration (amount-of-substance concentration) of substance.
It's rarely mentioned that when "M" is used in place of mol/L, it's supposed to be small caps "M" ($mathrmsmall M$), not just capital "M", but nobody seems to care.
Also note that both the term and the symbol are deprecated [1, p. 27].
The term molarity and the symbol $mathrmsmall M$ should no longer be used because they, too, are obsolete. One should use instead amount-of-substance concentration of $ceB$ and such units as $rm mol/dm^3$, $rm kmol/m^3$,
or $rm mol/L$.
Related questions
- What does the M in μM-Sux stand for?
- What does the unit M stand for?
References
- Thompson, A.; Taylor, B. N. Guide for the use of the international system of units (SI). NIST Special Publication 811 2008. (NIST)
answered May 12 at 15:40
andselisk♦andselisk
21.4k773140
$endgroup$
add a comment |
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Lowercase m
$m$ is the official symbol for the quantity mass.- m is an SI-prefix that stands for milli ($pue-3$), for example in mg (milligram).
$m$ is sometimes uses as the symbol for molality. This is not IUPAC recommended (they recommend $b$) and leads to the confusing definition $$m_textsolute = n_textsolute / m_textsolvent$$ where the first $m$ is for molality and the second one for mass.
Uppercase M
$M$ is used as symbol for the quantity molar mass (dimensions mass per amount of substance).
M is an SI-prefix that stands for mega ($pue6$), for example in MW (megawatts).
M is often used as an abbreviation for mol/L, and mM for mmol/L.
$M$ is sometimes used as a symbol for the quantity molarity (dimensions are amount of substance per volume, official IUPAC name is amount of substance concentration, and official IUPAC symbol is $c$). Textbooks that follow this convention sometimes use MM or ℳ as an alternate symbol for molar mass to avoid name conflicts. Combining the quantity $M$ with the unit M gives silly statements such as: $$M = 5~textM$$
Other useful information
- Make sure your lowercase m and uppercase M look different when you write or type, otherwise you are confusing your readers. If you type, quantities should be italicized and units should not. That also helps to distinguish the different meanings of m.
- You can't cancel m with m if they don't have the same meaning. It is fine to cancel the milli in mg/mL to obtain g/L, but not cancel $m$/mg to obtain 1/g.
edited May 13 at 11:58
orthocresol♦
41.3k7124255
answered May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
$endgroup$
1
$begingroup$
$mathrmM$ is an old (my 1995 textbook already calls it that) abbreviation for mol/L for labelling bottles, like "$mathrm2M$ HCl". It shouldn't be used in equations. The use of $M$ for molarity is really old. Profs still using that should be approached with a garlic bulb in one hand and a colt with a silver bullet in the other.
$endgroup$
– Karl
May 13 at 19:34
$begingroup$
@Karl This is not limited to old textbooks: chat.stackexchange.com/rooms/93601/…
$endgroup$
– Karsten Theis
May 13 at 20:32
$begingroup$
You get what you pay for, and the one you link is not the proverbial exception proving the rule ... Brr. My school textbooks (edition 1992) were better and more modern! They really use amu in an online chemistry textbook? When did they write that, in the late seventies?!? I regularily feel sorry for students from India (and other developing countries) asking questions here, for the outdated *#$& they are taught, but the US?!?
$endgroup$
– Karl
May 14 at 20:27
1
$begingroup$
(sorry for the rant ;-))
$endgroup$
– Karl
May 14 at 20:27
add a comment |
$begingroup$
Lowercase m
$m$ is the official symbol for the quantity mass.- m is an SI-prefix that stands for milli ($pue-3$), for example in mg (milligram).
$m$ is sometimes uses as the symbol for molality. This is not IUPAC recommended (they recommend $b$) and leads to the confusing definition $$m_textsolute = n_textsolute / m_textsolvent$$ where the first $m$ is for molality and the second one for mass.
Uppercase M
$M$ is used as symbol for the quantity molar mass (dimensions mass per amount of substance).
M is an SI-prefix that stands for mega ($pue6$), for example in MW (megawatts).
M is often used as an abbreviation for mol/L, and mM for mmol/L.
$M$ is sometimes used as a symbol for the quantity molarity (dimensions are amount of substance per volume, official IUPAC name is amount of substance concentration, and official IUPAC symbol is $c$). Textbooks that follow this convention sometimes use MM or ℳ as an alternate symbol for molar mass to avoid name conflicts. Combining the quantity $M$ with the unit M gives silly statements such as: $$M = 5~textM$$
Other useful information
- Make sure your lowercase m and uppercase M look different when you write or type, otherwise you are confusing your readers. If you type, quantities should be italicized and units should not. That also helps to distinguish the different meanings of m.
- You can't cancel m with m if they don't have the same meaning. It is fine to cancel the milli in mg/mL to obtain g/L, but not cancel $m$/mg to obtain 1/g.
edited May 13 at 11:58
orthocresol♦
41.3k7124255
answered May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
$endgroup$
1
$begingroup$
$mathrmM$ is an old (my 1995 textbook already calls it that) abbreviation for mol/L for labelling bottles, like "$mathrm2M$ HCl". It shouldn't be used in equations. The use of $M$ for molarity is really old. Profs still using that should be approached with a garlic bulb in one hand and a colt with a silver bullet in the other.
$endgroup$
– Karl
May 13 at 19:34
$begingroup$
@Karl This is not limited to old textbooks: chat.stackexchange.com/rooms/93601/…
$endgroup$
– Karsten Theis
May 13 at 20:32
$begingroup$
You get what you pay for, and the one you link is not the proverbial exception proving the rule ... Brr. My school textbooks (edition 1992) were better and more modern! They really use amu in an online chemistry textbook? When did they write that, in the late seventies?!? I regularily feel sorry for students from India (and other developing countries) asking questions here, for the outdated *#$& they are taught, but the US?!?
$endgroup$
– Karl
May 14 at 20:27
1
$begingroup$
(sorry for the rant ;-))
$endgroup$
– Karl
May 14 at 20:27
add a comment |
$begingroup$
Lowercase m
$m$ is the official symbol for the quantity mass.- m is an SI-prefix that stands for milli ($pue-3$), for example in mg (milligram).
$m$ is sometimes uses as the symbol for molality. This is not IUPAC recommended (they recommend $b$) and leads to the confusing definition $$m_textsolute = n_textsolute / m_textsolvent$$ where the first $m$ is for molality and the second one for mass.
Uppercase M
$M$ is used as symbol for the quantity molar mass (dimensions mass per amount of substance).
M is an SI-prefix that stands for mega ($pue6$), for example in MW (megawatts).
M is often used as an abbreviation for mol/L, and mM for mmol/L.
$M$ is sometimes used as a symbol for the quantity molarity (dimensions are amount of substance per volume, official IUPAC name is amount of substance concentration, and official IUPAC symbol is $c$). Textbooks that follow this convention sometimes use MM or ℳ as an alternate symbol for molar mass to avoid name conflicts. Combining the quantity $M$ with the unit M gives silly statements such as: $$M = 5~textM$$
Other useful information
- Make sure your lowercase m and uppercase M look different when you write or type, otherwise you are confusing your readers. If you type, quantities should be italicized and units should not. That also helps to distinguish the different meanings of m.
- You can't cancel m with m if they don't have the same meaning. It is fine to cancel the milli in mg/mL to obtain g/L, but not cancel $m$/mg to obtain 1/g.
edited May 13 at 11:58
orthocresol♦
41.3k7124255
answered May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
$endgroup$
Lowercase m
$m$ is the official symbol for the quantity mass.- m is an SI-prefix that stands for milli ($pue-3$), for example in mg (milligram).
$m$ is sometimes uses as the symbol for molality. This is not IUPAC recommended (they recommend $b$) and leads to the confusing definition $$m_textsolute = n_textsolute / m_textsolvent$$ where the first $m$ is for molality and the second one for mass.
Uppercase M
$M$ is used as symbol for the quantity molar mass (dimensions mass per amount of substance).
M is an SI-prefix that stands for mega ($pue6$), for example in MW (megawatts).
M is often used as an abbreviation for mol/L, and mM for mmol/L.
$M$ is sometimes used as a symbol for the quantity molarity (dimensions are amount of substance per volume, official IUPAC name is amount of substance concentration, and official IUPAC symbol is $c$). Textbooks that follow this convention sometimes use MM or ℳ as an alternate symbol for molar mass to avoid name conflicts. Combining the quantity $M$ with the unit M gives silly statements such as: $$M = 5~textM$$
Other useful information
- Make sure your lowercase m and uppercase M look different when you write or type, otherwise you are confusing your readers. If you type, quantities should be italicized and units should not. That also helps to distinguish the different meanings of m.
- You can't cancel m with m if they don't have the same meaning. It is fine to cancel the milli in mg/mL to obtain g/L, but not cancel $m$/mg to obtain 1/g.
edited May 13 at 11:58
orthocresol♦
41.3k7124255
answered May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
edited May 13 at 11:58
orthocresol♦
41.3k7124255
edited May 13 at 11:58
orthocresol♦
41.3k7124255
edited May 13 at 11:58
orthocresol♦
41.3k7124255
41.3k7124255
answered May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
answered May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
answered May 12 at 15:02
Karsten TheisKarsten Theis
6,3761048
6,3761048
1
$begingroup$
$mathrmM$ is an old (my 1995 textbook already calls it that) abbreviation for mol/L for labelling bottles, like "$mathrm2M$ HCl". It shouldn't be used in equations. The use of $M$ for molarity is really old. Profs still using that should be approached with a garlic bulb in one hand and a colt with a silver bullet in the other.
$endgroup$
– Karl
May 13 at 19:34
$begingroup$
@Karl This is not limited to old textbooks: chat.stackexchange.com/rooms/93601/…
$endgroup$
– Karsten Theis
May 13 at 20:32
$begingroup$
You get what you pay for, and the one you link is not the proverbial exception proving the rule ... Brr. My school textbooks (edition 1992) were better and more modern! They really use amu in an online chemistry textbook? When did they write that, in the late seventies?!? I regularily feel sorry for students from India (and other developing countries) asking questions here, for the outdated *#$& they are taught, but the US?!?
$endgroup$
– Karl
May 14 at 20:27
1
$begingroup$
(sorry for the rant ;-))
$endgroup$
– Karl
May 14 at 20:27
add a comment |
1
$begingroup$
$mathrmM$ is an old (my 1995 textbook already calls it that) abbreviation for mol/L for labelling bottles, like "$mathrm2M$ HCl". It shouldn't be used in equations. The use of $M$ for molarity is really old. Profs still using that should be approached with a garlic bulb in one hand and a colt with a silver bullet in the other.
$endgroup$
– Karl
May 13 at 19:34
$begingroup$
@Karl This is not limited to old textbooks: chat.stackexchange.com/rooms/93601/…
$endgroup$
– Karsten Theis
May 13 at 20:32
$begingroup$
You get what you pay for, and the one you link is not the proverbial exception proving the rule ... Brr. My school textbooks (edition 1992) were better and more modern! They really use amu in an online chemistry textbook? When did they write that, in the late seventies?!? I regularily feel sorry for students from India (and other developing countries) asking questions here, for the outdated *#$& they are taught, but the US?!?
$endgroup$
– Karl
May 14 at 20:27
1
$begingroup$
(sorry for the rant ;-))
$endgroup$
– Karl
May 14 at 20:27
1
1
$begingroup$
$mathrmM$ is an old (my 1995 textbook already calls it that) abbreviation for mol/L for labelling bottles, like "$mathrm2M$ HCl". It shouldn't be used in equations. The use of $M$ for molarity is really old. Profs still using that should be approached with a garlic bulb in one hand and a colt with a silver bullet in the other.
$endgroup$
– Karl
May 13 at 19:34
$begingroup$
$mathrmM$ is an old (my 1995 textbook already calls it that) abbreviation for mol/L for labelling bottles, like "$mathrm2M$ HCl". It shouldn't be used in equations. The use of $M$ for molarity is really old. Profs still using that should be approached with a garlic bulb in one hand and a colt with a silver bullet in the other.
$endgroup$
– Karl
May 13 at 19:34
$begingroup$
@Karl This is not limited to old textbooks: chat.stackexchange.com/rooms/93601/…
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– Karsten Theis
May 13 at 20:32
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@Karl This is not limited to old textbooks: chat.stackexchange.com/rooms/93601/…
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– Karsten Theis
May 13 at 20:32
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You get what you pay for, and the one you link is not the proverbial exception proving the rule ... Brr. My school textbooks (edition 1992) were better and more modern! They really use amu in an online chemistry textbook? When did they write that, in the late seventies?!? I regularily feel sorry for students from India (and other developing countries) asking questions here, for the outdated *#$& they are taught, but the US?!?
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– Karl
May 14 at 20:27
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You get what you pay for, and the one you link is not the proverbial exception proving the rule ... Brr. My school textbooks (edition 1992) were better and more modern! They really use amu in an online chemistry textbook? When did they write that, in the late seventies?!? I regularily feel sorry for students from India (and other developing countries) asking questions here, for the outdated *#$& they are taught, but the US?!?
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– Karl
May 14 at 20:27
1
1
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(sorry for the rant ;-))
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– Karl
May 14 at 20:27
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(sorry for the rant ;-))
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– Karl
May 14 at 20:27
add a comment |
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In addition to the original answer:
Lowercase
m is a symbol for for meta- prefix (locant).- m is a symbol for metastable [isotope].
- m is an abbreviation for "medium" or "multiplet" in spectroscopy.
$pum$ sometimes used in place of $pumi$ for mile, e.g. mph — miles-per-hour.
$m$ is a magnetic quantum number in NMR spectroscopy.
Uppercase
$ceM$ signifies [central] metal (not $ceMe$ — this one is methyl).- M is used to denote mesomeric effect.
- M is a symbol for aminoacid methionine.
M (minus, or Λ) is a left-handed helix in axial chirality.
Small caps
$mathrmsmall M$ is used for concentration (amount-of-substance concentration) of substance.
It's rarely mentioned that when "M" is used in place of mol/L, it's supposed to be small caps "M" ($mathrmsmall M$), not just capital "M", but nobody seems to care.
Also note that both the term and the symbol are deprecated [1, p. 27].
The term molarity and the symbol $mathrmsmall M$ should no longer be used because they, too, are obsolete. One should use instead amount-of-substance concentration of $ceB$ and such units as $rm mol/dm^3$, $rm kmol/m^3$,
or $rm mol/L$.
Related questions
- What does the M in μM-Sux stand for?
- What does the unit M stand for?
References
- Thompson, A.; Taylor, B. N. Guide for the use of the international system of units (SI). NIST Special Publication 811 2008. (NIST)
answered May 12 at 15:40
andselisk♦andselisk
21.4k773140
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add a comment |
$begingroup$
In addition to the original answer:
Lowercase
m is a symbol for for meta- prefix (locant).- m is a symbol for metastable [isotope].
- m is an abbreviation for "medium" or "multiplet" in spectroscopy.
$pum$ sometimes used in place of $pumi$ for mile, e.g. mph — miles-per-hour.
$m$ is a magnetic quantum number in NMR spectroscopy.
Uppercase
$ceM$ signifies [central] metal (not $ceMe$ — this one is methyl).- M is used to denote mesomeric effect.
- M is a symbol for aminoacid methionine.
M (minus, or Λ) is a left-handed helix in axial chirality.
Small caps
$mathrmsmall M$ is used for concentration (amount-of-substance concentration) of substance.
It's rarely mentioned that when "M" is used in place of mol/L, it's supposed to be small caps "M" ($mathrmsmall M$), not just capital "M", but nobody seems to care.
Also note that both the term and the symbol are deprecated [1, p. 27].
The term molarity and the symbol $mathrmsmall M$ should no longer be used because they, too, are obsolete. One should use instead amount-of-substance concentration of $ceB$ and such units as $rm mol/dm^3$, $rm kmol/m^3$,
or $rm mol/L$.
Related questions
- What does the M in μM-Sux stand for?
- What does the unit M stand for?
References
- Thompson, A.; Taylor, B. N. Guide for the use of the international system of units (SI). NIST Special Publication 811 2008. (NIST)
answered May 12 at 15:40
andselisk♦andselisk
21.4k773140
$endgroup$
add a comment |
$begingroup$
In addition to the original answer:
Lowercase
m is a symbol for for meta- prefix (locant).- m is a symbol for metastable [isotope].
- m is an abbreviation for "medium" or "multiplet" in spectroscopy.
$pum$ sometimes used in place of $pumi$ for mile, e.g. mph — miles-per-hour.
$m$ is a magnetic quantum number in NMR spectroscopy.
Uppercase
$ceM$ signifies [central] metal (not $ceMe$ — this one is methyl).- M is used to denote mesomeric effect.
- M is a symbol for aminoacid methionine.
M (minus, or Λ) is a left-handed helix in axial chirality.
Small caps
$mathrmsmall M$ is used for concentration (amount-of-substance concentration) of substance.
It's rarely mentioned that when "M" is used in place of mol/L, it's supposed to be small caps "M" ($mathrmsmall M$), not just capital "M", but nobody seems to care.
Also note that both the term and the symbol are deprecated [1, p. 27].
The term molarity and the symbol $mathrmsmall M$ should no longer be used because they, too, are obsolete. One should use instead amount-of-substance concentration of $ceB$ and such units as $rm mol/dm^3$, $rm kmol/m^3$,
or $rm mol/L$.
Related questions
- What does the M in μM-Sux stand for?
- What does the unit M stand for?
References
- Thompson, A.; Taylor, B. N. Guide for the use of the international system of units (SI). NIST Special Publication 811 2008. (NIST)
answered May 12 at 15:40
andselisk♦andselisk
21.4k773140
$endgroup$
In addition to the original answer:
Lowercase
m is a symbol for for meta- prefix (locant).- m is a symbol for metastable [isotope].
- m is an abbreviation for "medium" or "multiplet" in spectroscopy.
$pum$ sometimes used in place of $pumi$ for mile, e.g. mph — miles-per-hour.
$m$ is a magnetic quantum number in NMR spectroscopy.
Uppercase
$ceM$ signifies [central] metal (not $ceMe$ — this one is methyl).- M is used to denote mesomeric effect.
- M is a symbol for aminoacid methionine.
M (minus, or Λ) is a left-handed helix in axial chirality.
Small caps
$mathrmsmall M$ is used for concentration (amount-of-substance concentration) of substance.
It's rarely mentioned that when "M" is used in place of mol/L, it's supposed to be small caps "M" ($mathrmsmall M$), not just capital "M", but nobody seems to care.
Also note that both the term and the symbol are deprecated [1, p. 27].
The term molarity and the symbol $mathrmsmall M$ should no longer be used because they, too, are obsolete. One should use instead amount-of-substance concentration of $ceB$ and such units as $rm mol/dm^3$, $rm kmol/m^3$,
or $rm mol/L$.
Related questions
- What does the M in μM-Sux stand for?
- What does the unit M stand for?
References
- Thompson, A.; Taylor, B. N. Guide for the use of the international system of units (SI). NIST Special Publication 811 2008. (NIST)
answered May 12 at 15:40
andselisk♦andselisk
21.4k773140
edited May 14 at 7:15
answered May 12 at 15:40
andselisk♦andselisk
21.4k773140
answered May 12 at 15:40
andselisk♦andselisk
21.4k773140
answered May 12 at 15:40
andselisk♦andselisk
21.4k773140
21.4k773140
add a comment |
add a comment |
5
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What, pray tell, is the point of this question? Every textbook has a table with abbreviations and symbols explained, and anybody who listens to a General Chemistry I or II lecture learns them as he gets on.
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– Karl
May 12 at 21:11
7
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We're not going to have another twenty-five of these, are we?
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– David Richerby
May 12 at 22:32
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@Karl "Everyone who listens to a [...] lecture learns them [...]" - Do you have a reference to support that statement?
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– Karsten Theis
May 13 at 16:50
1
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Related: chemistry.stackexchange.com/questions/115202. In my experience, k and m cause the most confusion, and the related question was closed as too broad. So, @David Richerby, I'm not posing questions on any other roman letters, and I'm not going to get started on greek, either.
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– Karsten Theis
May 13 at 16:54
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No, but stil. I agree that the letter is a bit overused.
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– Karl
May 13 at 19:38