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From WordNet (r) 2.0 : [ wn ]
Dalton's law of partial pressures
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, law of partial
pressures]