The temperature of a rapidly expanding gas decreases. Explain why in terms of the first law of thermodynamics. (Hint: Consider whether the gas does work and whether heat transfer occurs rapidly into the gas through conduction.)
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From first law of thermodynamics the change in internal energy of a system is equal to the heat added to the system minus the work done by the system and it is given as,
U2 - U1 = Q - W
Here,U1 is the initial internal energy of the system,U2 is the final internal energy of the system, Q is the heat added to the system and W is the work done by the system.