Which description corresponds to Isobaric processes?

• A. Isobaric - constant pressure
• B. Isometric - constant volume
• C. Adiabatic - no heat exchange
• D. Isothermal - no temperature change

Answer: (A)

Isobaric processes are those in which the pressure stays the same while the system changes state. In a gas-filled piston, you can add heat and let the piston move so the pressure remains constant; the volume can change and the temperature rises as heat is added. That makes the description "constant pressure" the correct match for an isobaric process. The other phrases describe different constraints: constant volume is isometric, no heat exchange is adiabatic, and no temperature change is isothermal.