(n) (chemistry and physics) law stating that the pressure exerted by a mixture of gases equals the sum of the partial pressures of the gases in the mixture; the pressure of a gas in a mixture equals the pressure it would exert if it occupied the same volume alone at the same temperature, Syn. Dalton's law of partial pressures, law of partial pressures
(n) pressure applied anywhere to a body of fluid causes a force to be transmitted equally in all directions; the force acts at right angles to any surface in contact with the fluid, Syn. Pascal's law of fluid pressures, Example:the hydraulic press is an application of Pascal's law