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What happens to the temperature of a gas when it expands adiabatically?

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Question: What happens to the temperature of a gas when it expands adiabatically?

Options:

  1. It increases
  2. It decreases
  3. It remains constant
  4. It depends on the gas

Correct Answer: It decreases

Solution: 

During adiabatic expansion, a gas does work on its surroundings, which results in a decrease in temperature.

What happens to the temperature of a gas when it expands adiabatically?

Practice Questions

Q1
What happens to the temperature of a gas when it expands adiabatically?
  1. It increases
  2. It decreases
  3. It remains constant
  4. It depends on the gas

Questions & Step-by-Step Solutions

What happens to the temperature of a gas when it expands adiabatically?
Correct Answer: Temperature decreases.
  • Step 1: Understand what adiabatic means. Adiabatic means that no heat is exchanged with the surroundings.
  • Step 2: Know that when a gas expands, it pushes against something (like a piston). This is called doing work.
  • Step 3: Realize that when the gas does work, it uses energy from itself.
  • Step 4: Since the gas is not getting heat from outside (adiabatic), it loses energy.
  • Step 5: When the gas loses energy, its temperature decreases.
  • Adiabatic Process – An adiabatic process is one in which no heat is exchanged with the surroundings.
  • Work Done by Gas – During expansion, the gas does work on the surroundings, which requires energy.
  • Temperature Change – The energy used for work results in a decrease in the internal energy of the gas, leading to a drop in temperature.
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