Question

when high pressure is applied to a gas, its ____.
a volume first increases and then decreases
b volume decreases
c volume remains constant
d volume increases

Explanation:

According to Boyle's Law, for a given mass of gas at a constant temperature, pressure and volume are inversely proportional ($P_1V_1 = P_2V_2$). When high pressure is applied (i.e., $P_2>P_1$), the volume ($V_2$) must decrease to maintain the equality.

Answer:

B. Volume decreases