What happens to the temperature of a gas during an isothermal expansion? (2021)

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Question: What happens to the temperature of a gas during an isothermal expansion? (2021)

Options:

Correct Answer: Remains constant

Solution:

During an isothermal expansion, the temperature of the gas remains constant as the system absorbs heat to do work.

What happens to the temperature of a gas during an isothermal expansion? (2021)

What happens to the temperature of a gas during an isothermal expansion? (2021)

Step 1: Understand what isothermal means. Isothermal means 'constant temperature'.
Step 2: Know that during an expansion, a gas is allowed to increase in volume.
Step 3: Realize that when a gas expands, it does work on its surroundings.
Step 4: Understand that to keep the temperature constant during this expansion, the gas must absorb heat from its surroundings.
Step 5: Conclude that during an isothermal expansion, the temperature of the gas does not change; it stays the same.

Isothermal Process – An isothermal process is one in which the temperature of the system remains constant while the gas expands or contracts.
Heat Absorption – During isothermal expansion, the gas absorbs heat from the surroundings to maintain constant temperature while doing work.
Work Done by Gas – The gas does work on the surroundings during expansion, which requires energy input in the form of heat.