proportional 1. According to Boyle's Law, when is held constant, the pressure and volume of a gas are A. mass, equally C temperature, equally B. mass, inversely D. temperature, inversely 2 Volume and temperature have a/an proportionality A. direct C inversely B. equal D. relationship cannot be determined 3. According to Boyle's Law, pressure and volume are inversely related which means that A. when pressure increases, volume increases. B. when pressure decreases, volume decreases. C. when pressure de decreases, volume increases. D. when pressure doubles, volume triples. 4. According to Charles' Law, volume and temperature are directly related. This means that A. when temperature decreases, volume increases. B. when temperature doubles, volume reduces to one half. C. when temperature increases, volume decreases. D. when temperature increases, volume increases. 5. Which variable must be held constant for Charles's Law to apply? C. volume B. temperature D. all of them A. pressure