Question

In an isochoric process, which parameter remains constant?

• A. Temperature remains constant
• B. Pressure remains constant
• C. Volume remains constant
• D. Concentration remains constant

Hint:

Break down the word isochoric into its root meaning related to space or volume.

Answer 1

The Correct Option is C

Step 1: The word isochoric comes from iso (same) and choric (relating to volume), so an isochoric process is, by definition, a constant volume process.

Step 2: In an isochoric process the system is held in a rigid, fixed volume container, so as heat is added or removed, the volume cannot change even though temperature and pressure are free to change.

Step 3: Since no volume change occurs, \( dV = 0 \), and consequently the work done by the system, \( w = -P\,dV \), is zero for an isochoric process.

Step 4: Comparing with the other options: temperature and pressure both typically change in an isochoric process (for example, heating a gas in a sealed rigid container raises both), and concentration is not the defining parameter at all.

\[ \boxed{\text{Volume remains constant}} \]