Questions tagged [ideal-gas]
A gas that behaves as randomly moving, non-interacting molecules. This allows a simplified equation of state.
1,319 questions
-2 votes
0 answers
20 views
How fast will an ideal gas move into a void (vacuum)? [duplicate]
Premise Imagine we could magically / instantaneously create a void - a near-perfect vacuum - in the atmosphere (or any other similar space filled with a near-ideal gas). Question The instant after ...
- 105
3 votes
1 answer
174 views
Ideal gas equation
While deriving ideal gas equation we assumed the container to be a cuboid and then we took the volume to be $lbh$ where l, b, h are length, breadth, and height respectively. Will the equation still be ...
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-3 votes
3 answers
296 views
Why Can't We Simplify the Ideal Gas Law to $pV = nT$?
As someone with a small background in physics, I find myself questioning the necessity of the ideal gas constant $R$ in the Ideal Gas Law $pV = nRT.$ Why can’t we simplify this relationship to $pV =nT$...
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0 votes
1 answer
58 views
What happens to the kinetic energy of the piston when gas expands with unequal pressure inside and outside?
Let an ideal gas is under piston with mass but no friction at pressure $P_1$, temperature $T_1$. Imagine a reversible, quasi-static process from that state to a state with pressure $P_2$ and ...
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-2 votes
1 answer
123 views
Can ideal gasses achieve negative temperature? [closed]
I wish to know if ideal gasses can achieve negative temperatures and if it has been experimentally achieved in some form or not. The reason I am interested in this is because, for ideal gasses we have ...
- 1,726
0 votes
2 answers
415 views
Why does Callen define free expansion to be non-quasistatic?
On p. 99 in Callen's Thermodynamics, there is a practice problem where one is supposed to show that for the continuous (proceeding through infinitely many transformations $V\to V+dV$) free expansion ...
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1 vote
1 answer
113 views
Hot air balloon launch and descent
Is it possible to plot P, V and T variables of an ideal gas contained in a flexible rising and / descending air balloon ? The balloon is filled with hot air or Helium of density less than air after ...
- 1,305
2 votes
0 answers
69 views
Where does energy go in system with piston containing ideal gas and mass attached such that the mass expands the gas when pulled by gravity? [closed]
If i have a system of a piston with a sealed ideal gas and a mass attached such that the piston expands when the mass is allowed to fall, the piston has no internal change energy as the work done by ...
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2 votes
2 answers
186 views
Does increasing the temperature of a gas increase the frequency of collisions with the wall, if the pressure remains constant? [closed]
I encountered this elementary physics question recently. There is a gas in a syringe. After being heated, the syringe expands. The question asks if the frequency of collisions of the gas with the wall ...
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1 vote
2 answers
242 views
How far does a can need to be submerged until it sinks?
I'm helping out a family friend with this high school physics problem: An empty can made of iron and without a lid has mass 62 g och inner volume 402 cubic centimetres. It is turned upside down and ...
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1 vote
0 answers
107 views
How to calculate hydrogen concentration profile and equilibrium solubility in a hollow metal cylinder exposed to hydrogen gas?
I'm trying to model hydrogen gas (H₂) ingress into a small cylindrical metal sample with the following dimensions: Outer diameter (OD): 8 mm Inner diameter (ID): 3 mm Length (L): 30 mm OR 5 mm; I don'...
1 vote
2 answers
386 views
Can ideal gas law be used for very hot plasma?
I can't readily find the specific heat capacity values for plasmas, presumably because there are so many of them. So I was wondering if, assuming the plasma is so hot that any ionization that could ...
- 385
0 votes
1 answer
131 views
Filling of gas slowly into a rigid balloon [closed]
While working my way through the Jhan Kalda handouts on thermodynamics i encountered the following problem Consider a balloon which has thick rigid walls and from which all the air has been pumped ...
4 votes
4 answers
265 views
Physical/Intuitive understanding of $pV^γ$ in an isentropic process
I'm currently studying thermodynamics and have run across numerous derivations for the isentropic relation: $pV^γ = const$. Although I understand each of these derivations algebraically, none of them ...
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2 votes
1 answer
180 views
Variation of atmospheric pressure with height
So in a volume of Resnick halladay's book adapted by Amit Gupta. There was a following derivation of variation of atmospheric pressure with height. In the page 849, it was written from the ideal gas ...
