Physics Thermodynamics DUHS 2023
PMDC Verified Question 26 of 54
The property of the system that does not change during an adiabatic change
A
Pressure
B
Amount of heat
C
Temperature
D
Volume
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Amount of heat
1. Concept:

An adiabatic process is strictly defined by extreme thermal insulation or extremely rapid expansion/compression, completely preventing heat exchange.

2. Formula:

$$\Delta Q = 0$$

3. Solution:

  • Because the boundary is perfectly insulated, thermal energy (heat) can neither enter nor escape the system.


  • Therefore, the total amount of heat (\(Q\)) transferred remains zero; the heat content is unchanged from outside sources.


  • In contrast, because work is done, the internal energy, temperature, pressure, and volume all dynamically change.


4. Why other options are incorrect:

In an adiabatic compression, work is done ON the gas, so volume decreases, pressure spikes, and temperature rises. Only the heat transfer strictly remains zero.

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