For a given mass of a gas at constant temperature, if the value V becomes 3 times, the pressure will becomes__________?
Correct answer: B. P/3
- A. 3P
- B. P/3
- C. 3P/T
- D. 6P
Explanation
At constant temperature, Boyle's law gives P1V1 = P2V2. If V2 = 3V1, then P2 = P1V1/(3V1) = P1/3, so the pressure becomes P/3 in the same pressure units as P. The likely trap is 3P, which reverses the inverse relationship between pressure and volume.
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About Boyle's Law
Boyle's law states that the pressure of a fixed mass of gas varies inversely with its volume when temperature remains constant. Problems use the relationship P₁V₁ = P₂V₂, pressure-volume graphs and volume changes, with constant temperature distinguishing it from Charles's law.
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