There is no change in internal energy of an ideal gas when it undergoes

There is no change in internal energy of an ideal gas when it undergoes
  1. isothermal expansion
  2. adiabatic expansion
  3. free expansion
  4. isobaric expansion

Solution

In free expansion, the ideal gas is allowed to expand into a vacuum. This happens quickly, so there is no heat transferred. No work is done, because the gas does not displace anything. According to first law of thermodynamics, this means that \(\Delta E_{\text {internal }}=0\) Hence, there is no change in internal energy of an ideal gas when it undergoes free expansion.

Asked in: MHT CET Full Test 13

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