Question

Which of the following is constant in an isochoric process?
A) Pressure
B) Volume
C) Temperature
D) None of these

Answer 1

Thermodynamics has defined names for a number of processes in which one or more physical quantities are kept constant. These physical quantities may include, but is not limited to, pressure, temperature, volume, etc. The Isochoric process is one of these.

Complete step by step solution:
Thermodynamics is all about different types of reactions and experiments on them. Thermodynamics has defined names for a number of basic processes which have made the study about it as well as the talk about it easier.

Let’s have a look at all of the options to get our answer.

Option A: Pressure. Any process which keeps the pressure throughout the reaction constant is called an isobaric process. ‘iso’ in its name means constant and ‘bar’ is a unit of pressure. Hence the isobaric indicates constant pressure. This is not the correct option.

Option B: Volume. Any process which keeps the volume throughout the reaction as constant is called an isochoric process. ‘iso’ in its name means constant and ‘choric’ is a reference to volume. Hence the term isochoric indicates constant volume. This is the correct option.

Option C: Temperature. Any process which keeps the temperature throughout the reaction as constant is called an isothermal process. ‘iso’ in its name means constant and ‘thermal’ is a reference to volume. Hence the term isothermal indicates constant temperature. This is not the correct option.

Therefore, Option B is the correct answer.

Note: Isobaric, Isochoric, and Isothermal are thermodynamic terms made by joining two Greek terms according to their meaning. ‘iso’ is a Greek term for constant. ‘bar’ is a unit of pressure. Hence the isobaric indicates constant pressure. ‘choric’ is a reference to volume. Hence the term isochoric indicates constant volume. ‘thermal’ is a reference to volume. Hence the term isothermal indicates constant temperature.