Boyle's Law[edit]Main article: Boyle's LawBoyle's Law, published in 1662, states that, at constant temperature, the product of the pressure and volume of a given mass of an ideal gas in a closed system is always constant. It can be verified experimentally using a pressure gauge and a variable volume container. It can also be derived from the kinetic theory of gases: if a container, with a fixed number of molecules inside, is reduced in volume, more molecules will strike a given area of the sides of the container per unit time, causing a greater pressure.As a mathematical equation, Boyle's Law is written as either:P propto frac{1}{V}, orPV=k_1, orP_1 V_1=P_2 V_2,where P is the pressure, and V is the volume of a gas, and k1 is the constant in this equation (and is not the same as the proportionality constants in the other equations below). The statement of Boyle 's law is as follows:The volume of a given mass of a gas is inversely related to the pressure exerted on it at a given temperature and given number of moles.
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