SAT Subject Physics Practice Question 132: Answer and Explanation

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Question: 132

5. An ideal gas is confined to a container whose volume is fixed. If the container holds n moles of gas, by what factor will the pressure increase if the absolute temperature is increased by a factor of 2 ?

B. 2
C. 2nR

Correct Answer: B


Because the gas is confined, n remains constant, and because we’re told the volume is fixed, V remains constant as well. Since R is a universal constant, the ideal gas law, PV = nRT, tells us that P and T are proportional. Therefore, if T increases by a factor of 2, then so does P.

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