Is gas compression endothermic or exothermic
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Answer:
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When going from liquid to gas we are adding heat (boiling). At a molecular level molecules in the liquid level are getting farther apart from each other (expanding) thus liquid to gas is expansion which is endothermic. Same principle applies in the gas phase. If you go from compressed gas to expanded gas the process would be endothermic. The reverse is true for exothermic
In terms of the piston system, I think they might be talking about Potential Energy in that case. When the piston is lowered volume decreases and pressure is increased. The molecules of gas are close together and they don't want to be thus the gas has a higher potential energy. When the piston is raised, volume is increased and pressure decreased. The gas molecules have more space to get away from each which they like therefore potential energy of the gas is decreased.
Thus it is endothermic....
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