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In an isothermal process, how does the internal energy of an ideal gas change?

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Question: In an isothermal process, how does the internal energy of an ideal gas change?

Options:

  1. Increases
  2. Decreases
  3. Remains constant
  4. Depends on the amount of gas

Correct Answer: Remains constant

Solution: 

In an isothermal process for an ideal gas, the temperature remains constant, and thus the internal energy also remains constant.

In an isothermal process, how does the internal energy of an ideal gas change?

Practice Questions

Q1
In an isothermal process, how does the internal energy of an ideal gas change?
  1. Increases
  2. Decreases
  3. Remains constant
  4. Depends on the amount of gas

Questions & Step-by-Step Solutions

In an isothermal process, how does the internal energy of an ideal gas change?
  • Step 1: Understand what an isothermal process is. It is a process where the temperature of the system remains constant.
  • Step 2: Know that for an ideal gas, the internal energy depends only on temperature.
  • Step 3: Since the temperature does not change in an isothermal process, the internal energy also does not change.
  • Step 4: Conclude that in an isothermal process for an ideal gas, the internal energy remains constant.
  • Isothermal Process – An isothermal process is a thermodynamic process in which the temperature of the system remains constant.
  • Internal Energy of Ideal Gas – For an ideal gas, the internal energy is a function of temperature; thus, if the temperature is constant, the internal energy does not change.
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