Question

If a gas expands adiabatically it's temperature

Answer 1

Answer:

If a gas expands adiabatically its temperature drops(decreases)

Answer 2

From the first law of thermodynamics, we know,

dU = dQ - dW

For an ideal gas dW > 0 and hence dU <0 and hence the internal energy decreases. Hence when U decreases, the average kinetic energy of all the molecules decreases. Therefore the temperature also decreases.

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