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one of the fundamental gas laws, according to which, at a constant temperature, the volume V of a given mass of an ideal gas is inversely proportional to its pressure ρ—that is, pV = C = const. (See Figure 1.) The constant C is proportional to the mass of the gas (the number of moles) and its absolute temperature.
The law is based on the experimental data of the English scientist R. Boyle (1662) and was established independently by the French scientist E. Mariotte (1676).
The Boyle-Mariotte law follows from the kinetic theory of gases if it is assumed that the dimensions of the molecules are negligibly small in comparison to the distance between them and that there is no intermolecular interaction. In other words, the Boyle-Mariotte law is strictly satisfied for an ideal gas. For real gases, for which it is not possible to disregard the influence of molecular dimensions and interactions, the Boyle-Mariotte law is satisfied approximately (see Figure 2); the further the gas is from the critical state, the better the approximation.