Okay. If temperature stays the same, we MUST have perfectly elastic collisions between the molecules and the walls of the container(s). That must therefore confirm perfectly elastic collisions between molecules, which I did not know beforehand. Thanks.
Last question, at what molecule size do...
Upon further consideration, there is no geological evidence that the ground/ formations in the Earth above an underground gas reservoir are cooler than right next to it. Perhaps the difference is so small as not to be noticed. That definitely has not been reported, as it would be a wonderful...
This I do not understand as the two situations are too different. Let's keep simple- A gas is in a completely and absolutely insulated container. What happens to the gas temperature and pressure over time? Both hold steady / constant OR another exchange occurs?
Indeed, in space where radiate losses would allow the temperature to drop to near zero K, pressure would drop per the ideal gas law. Do the gas collisions heat up the container, that then radiates away the energy? But without heat loss to the surroundings (adiabatic) what would happen to the gas...
Gas pressure in a closed chamber at constant temperature will last forever, unless leaking or chemical reactions occur. Examples are methane in underground gas reservoirs that are hundreds of thousands of years old. Gases stored in bottles. Pressure comes from the gas atoms (with velocity)...