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Asked in Premeth Test 6 — Thermodynamics (physics)Moderate

The equation W = P(V2-V1) represent work done by a gas in:

Correct answer: C. Isobaric

  • A. Free expansion
  • B. An isothermal expansion
  • C. Isobaric
  • D. An expansion at constant temperature

Explanation

The equation W = P(V2-V1) is used to calculate work done during an isobaric process, where the pressure remains constant. This is why Option C is correct. In contrast, free expansion involves no work done because there is no external pressure, making Option A incorrect. Option B and Option D refer to processes that occur at constant temperature, which require the use of different equations to calculate work, thus making them incorrect in this context.

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About Thermodynamics

Thermal equilibrium and heat explain how temperature and energy transfer are related, while molar specific heats describe the heat required by a gas at constant volume or constant pressure. The first law connects heat supplied, work done and change in internal energy, with sign conventions kept distinct from temperature changes.

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