Question

Which of the following processes is isobaric?

• A. Expansion of gas at constant pressure.
• B. Compression of gas at constant volume.
• C. Heating of gas with no change in temperature.
• D. Expansion of gas with no heat exchange.

Hint:

Remember the Greek root meanings: "baros" means weight or pressure.
Therefore, isobaric always corresponds to constant pressure, just like barometers measure atmospheric pressure.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
The question requires identifying which of the described thermodynamic processes corresponds to an isobaric process.

Step 2: Key Formula or Approach: Thermodynamic processes are classified based on the property that remains constant during the process:
Isobaric: Constant Pressure (\(P = \text{constant}\)).
Isochoric (or Isometric): Constant Volume (\(V = \text{constant}\)).
Isothermal: Constant Temperature (\(T = \text{constant}\)).
Adiabatic: No Heat Exchange (\(Q = 0\)).

Step 3: Detailed Explanation:

• The prefix "iso-" means equal or constant, and "bar" is a unit of pressure. Therefore, "isobaric" translates directly to constant pressure.

• Option (A): "Expansion of gas at constant pressure" is, by definition, an isobaric expansion process. The volume increases while pressure remains fixed.

• Option (B): "Compression of gas at constant volume" represents an isochoric process.

• Option (C): "Heating of gas with no change in temperature" describes an isothermal process.

• Option (D): "Expansion of gas with no heat exchange" describes an adiabatic process.

Step 4: Final Answer: Thus, the expansion of gas at constant pressure is an isobaric process.