All Questions
8 questions
2
votes
2
answers
3k
views
Why is gas pressure measured in mmHg?
Pressure can be measured in $\pu{mmHg}$ which is equal to the pressure exerted by a “column of mercury” of a height expressed in $\pu{mm},$ at $\pu{0 °C}$ under Earth’s normal gravity.
Does the ...
4
votes
2
answers
727
views
Regarding units of water potential and chemical potential
If water potential is nothing but the chemical potential of a given solution, then why do their units differ?
If the unit for the latter is taken as 'Energy per molecule' (which makes sense to me ...
- 49
2
votes
3
answers
1k
views
About the use of pascal or atmosphere in chemistry
I was wondering if there are specific formulae in chemistry for which it is "compulsory" or convenient to use atmosphere (atm) rather than pascal (or even mmHg) as a unit of measurement.
Of course, ...
- 229
-3
votes
2
answers
322
views
What will be unit of volume in V=nRT/p if p is in Torr instead of atm? [closed]
$V=nRT/p$, where $n$ is amount of gas in $\mathrm{mol}$, $R$ is gas constant, $V$ is volume in $\pu{dm3}$, and $p$ is pressure in $\pu{atm}$.
What happens to $R$ if $p$ is in $\pu{Torr}$ instead of $...
- 1
2
votes
0
answers
3k
views
Conversion of a permeability value from barrer to SI unit
I have done a permeability experiment on LDPE in the presence of air. At $\pu{30^\circ C}$, the permeability was found to be 1.846 barrer.
Now I am trying to apply this permeability value to a ...
- 31
5
votes
1
answer
822
views
Dealing with different units (psi) in ideal gas equation
My assignment is as follows:
A sample of air is trapped in a container at $\pu{16.2 psi}$. If the initial temperature is increased from $\pu{10 ^\circ C}$ to $\pu{32 ^\circ C}$, what is the final ...
- 51
3
votes
1
answer
30k
views
Convert from Pa to Pa to J/dm^3 [closed]
Given the value 380 PaK^-1, how do I convert Pa to Jdm-3?
I know that 1 joule = 1 Nm, and that 1 pascal = 1 N/m^2.
But where does the dm^-3 (or L) come into this? I don't know where to start.
- 161
16
votes
1
answer
35k
views
What is the difference between the units 'torr' and 'mm of Hg'?
According to present definition torr and mm of Hg differ though slightly.
I am still confused over it. Can someone write an explicit answer differentiating between them and the reason for ...
- 1,804