20 cubic inches of a gas with an absolute pressure of 5 psi is compressed until its pressure reaches 10 psi. what is the new volume of the gas? (assume that there's no change in temperature.)
a. 100 cubic inches
b. 40 cubic inches
c. 10 cubic inches
d. 5 cubic inches end of exam

The correct answer is C.

We will use Boyle's law that states that for a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional. 

P1 V1 = P2 V2

Where

 P1 is initial pressure = 5 psi

V1 is initial volume = 20 cubic inch

P2 is final pressure = 10 psi

V2 is final volume = unknown

V2 = P1,V1 / P2

V2 = 20 × 5 / 10

V2 = 100/10

V2 = 10 cubic inches

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