SAT Subject Physics Practice Question 581: Answer and Explanation

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Question: 581

7. If the pressure acting on an ideal gas that is kept at constant temperature is multiplied by four, its volume

A. triples.
B. reduces to 1/3.
C. increases by four.
D. reduces to 1/4.
E. There is not enough information to tell.

Correct Answer: D


The correct answer is (D). An ideal gas follows Boyle's law. If the pressure increases by a factor of four, the volume decreases by a factor of four. Whatever the change in one, the other is indirectly related by the same factor.

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