Physics Thermodynamics UHS 2024
PMDC Verified Question 10 of 54
During the isothermal process, the temperature
A
Remains constant during the initial phase of the process
B
Remains constant throughout the process
C
Increases throughout the process
D
Alters throughout the process
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Remains constant throughout the process
1. Concept:

An isothermal process is defined by strict thermal equilibrium with a massive external heat reservoir, ensuring the system's temperature never drifts.

2. Formula:

$$T(t) = \text{constant}$$

3. Solution:

  • For a process to be mathematically classified as isothermal, the temperature \(T\) must not vary at any singular moment.


  • The heat reservoir actively supplies or removes heat exactly as needed throughout the entire duration of the volume change to strictly hold \(T\) constant from start to finish.


4. Why other options are incorrect:

If temperature alters or only remains constant initially, the mathematical integration for isothermal work (\(W = nRT \ln(V_2/V_1)\)) becomes invalid. It must be constant the entire time.

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