What is the change in internal energy of an ideal gas when it expands isothermal

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Question: What is the change in internal energy of an ideal gas when it expands isothermally? (2021)

Options:

Correct Answer: Zero

Solution:

In an isothermal process for an ideal gas, the internal energy remains constant, hence the change in internal energy is zero.

What is the change in internal energy of an ideal gas when it expands isothermally? (2021)

What is the change in internal energy of an ideal gas when it expands isothermally? (2021)

Step 1: Understand what an ideal gas is. An ideal gas is a theoretical gas that follows the ideal gas law perfectly.
Step 2: Know what isothermal means. Isothermal means that the temperature of the gas remains constant during the process.
Step 3: Recall the relationship between internal energy and temperature for an ideal gas. The internal energy of an ideal gas depends only on its temperature.
Step 4: Since the temperature is constant in an isothermal process, the internal energy does not change.
Step 5: Conclude that the change in internal energy is zero because there is no change in temperature.

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