Universal and Individual Gas Constant

AI Thread Summary
The discussion revolves around confusion regarding the ideal gas law equation Pv=RT and the constants involved. The user seeks clarification on whether R refers to the Universal Gas Constant or the Individual Gas Constant, which depends on the context of volume used. They also inquire about the difference between Molar Volume and Specific Volume, confirming that they are distinct concepts. The user questions the discrepancy between the commonly cited Molar Gas Constant of 8.314 J/(K·mol) and the value of 8314 mentioned in their notes, suggesting it may be a typo. Systematic answers are requested to clear up these confusions.
Altairs
Messages
125
Reaction score
0
I got injured while playing football and had to miss a Thermodynamics-I lecture. Got the notes afterwards but they tend to make things more complicated. The notes starts with :-

Pv=RT

Which R is this the Universal Gas Constant or the Individual Gas Constant ?

Is the Molar Volume and Specific Volume same thing?

Then it says R = \frac{R_{u}}{Mol Wt.}, which seems alright.

Then it says that :-

For EE :-

R = \frac {1545}{Mol Wt.}

For SI :-

R = \frac {8314}{Mol Wt.}

Question is that I have always seen the Molar Gas Constant to be 8.134 JK^{-1}mol^{-1}. How does 8314 come ?

I'll be obliged if someone can give systematic answers. this way my confusion will be eliminated.
(looks like there's some problem with LaTex)
 
Last edited:
Physics news on Phys.org
Altairs said:
I got injured while playing football and had to miss a Thermodynamics-I lecture. Got the notes afterwards but they tend to make things more complicated. The notes starts with :-

Pv=RT

Which R is this the Universal Gas Constant or the Individual Gas Constant ?
It could be either, depending on whether v is the volume per mole or the volume per unit mass.
Is the Molar Volume and Specific Volume same thing?
Molar Volume is volume per mole and Specific Volume is volume per unit mass
Then it says R = \frac{R_{u}}{Mol Wt.}, which seems alright.

Then it says that :-

For EE :-

R = \frac {1545}{Mol Wt.}

For SI :-

R = \frac {8314}{Mol Wt.}

Question is that I have always seen the Molar Gas Constant to be 8.134 JK^{-1}mol^{-1}. How does 8314 come ?

I'll be obliged if someone can give systematic answers. this way my confusion will be eliminated.
(looks like there's some problem with LaTex)
It's not clear. It could be a typo.
 
Thread 'Question about pressure of a liquid'
I am looking at pressure in liquids and I am testing my idea. The vertical tube is 100m, the contraption is filled with water. The vertical tube is very thin(maybe 1mm^2 cross section). The area of the base is ~100m^2. Will he top half be launched in the air if suddenly it cracked?- assuming its light enough. I want to test my idea that if I had a thin long ruber tube that I lifted up, then the pressure at "red lines" will be high and that the $force = pressure * area$ would be massive...
I feel it should be solvable we just need to find a perfect pattern, and there will be a general pattern since the forces acting are based on a single function, so..... you can't actually say it is unsolvable right? Cause imaging 3 bodies actually existed somwhere in this universe then nature isn't gonna wait till we predict it! And yea I have checked in many places that tiny changes cause large changes so it becomes chaos........ but still I just can't accept that it is impossible to solve...
Back
Top