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As the volume of a gas increases from 15.0 mL to 20.0 mL, the pressure decreases from 125.2 kPa to 97.8 kPa. This inverse relationship between pressure and volume is known as Boyle's Law. According to Boyle's Law, at constant temperature, the pressure of a gas is inversely proportional to its volume. This means that as the volume of a gas increases, its pressure decreases, and vice versa.