Thermodynamics

Question

In isothermal process, which of the following is not true?

  • Temperature remains constant

  • Internal energy does not change

  • No heat enters or leaves the system

  • none of the above

Answer

C.

No heat enters or leaves the system

In an isothermal process ( Temperature fixed), the ideal gas equation gives

PV = constant

i.e pressure of a given mass of gas varies inversely as its volume. In the isothermal process, heat enters or leaves the system, so keep the temperature constant, so statement (C) is wrong.

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