If the volume of a gas is held constant and we increase its temperature then_______________?
Correct answer: B. its pressure rises
- A. its pressure is constant
- B. its pressure rises
- C. its pressure falls
- D. any of above
Explanation
At constant volume, the ideal-gas relation P/T = constant applies, so pressure increases directly with absolute temperature. Increasing the temperature therefore makes the gas pressure rise. The common wrong choice is a, which would apply only if the temperature were also held constant.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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