10
votes
Why expansion of real gases lead to cooling?
There are various conditions which might apply while a gas expands.
adiabatic (isentropic) expansion. Gas does work on its surroundings (pushing on the boundary as the boundary moves) so loses energy....
- 56.8k
3
votes
Why expansion of real gases lead to cooling?
The reason given in the book stays on a kinetic theory level of description. I think it is not the simplest level to explain the phenomenon. It is much better to start acknowledging that in a free ...
3
votes
Resistivity: related to $V/I$ or $dV/dI$?
In principle, we distinguish static and differential resistivity. The differential resistivity depends from the point on the current-voltage characteristics where we calculate the derivative, so we ...
- 57.6k
2
votes
Why expansion of real gases lead to cooling?
Let us consider gas molecules collision with the piston to be fairly elastic in nature. While we expand the gas by lifting the piston with some velocity u. And let the gas molecules be traveling ...
- 127
1
vote
A bit funny practical task: frozen dumplings in boiled water, how temperature changes and when will boil again?
Assuming you have boiling water and standard conditions (T = 20°C, P = 101.3 kPa) and do not add any energy to it, it will stop boiling due to heat loss to the environment. There is no need to add the ...
- 71
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