An air bubble emerges from the bottom of the reservoir. Does this change: a) the internal energy of the gas in the bubble;

An air bubble emerges from the bottom of the reservoir. Does this change: a) the internal energy of the gas in the bubble; b) the potential energy of the bubble? Gas expansion occurs at a constant temperature (isothermal).

a) if the bubble floats up fast enough, the temperature does not have time to change, which means that the internal energy does not change; b) the potential energy of the bubble increases.

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