Question

Which of the following is zero for an isochoric process?

• A. Volume
• B. Temperature
• C. Pressure
• D. None of the above

Answer 1

The correct option is A

Volume

The explanation for correct option:

(a) Volume

1. A thermodynamic process taking place at constant volume is known as the isochoric process.
2. It is also sometimes called as an isometric process or constant-volume process.
3. An isochoric process is one for which, ${\mathrm{V}}_{\mathrm{i}}={\mathrm{V}}_{\mathrm{f}}(∆\mathrm{v}=0,\mathrm{dV}=0)$
4. The work done is zero, since $\mathrm{dW}=\mathrm{PdV}(\mathrm{dV}=0)\Rightarrow \mathrm{dW}=0$

The explanation for incorrect option:

(b) Temperature

1. A thermodynamic process in which the temperature of a system remains constant is called isothermal process.
2. The transfer of heat into or out of the system happens so slowly that thermal equilibrium is maintained.

(c) Pressure

1. A thermodynamic process taking place at constant pressure is called isobaric process.

Therefore, Option (a) is correct, Change in volume is zero in an isochoric process.