boyle’s law states that when a sample of gas is compressed at a constant temperature, the pressure P and volume ???? satisfy the equation cpv , where ???? is constant. suppose that at a certain instant the volume is 600 cm3, the pressure is 150 kpa, and the pressure is increasing at a rate of 20 kpa/min. at what rate is the volume decreasing at this instant? (hint: use the product rule when you find the derivative.)