Dalton's law

Century Dictionary and Cyclopedia

1. n. See law.

Wiktionary

1. n. chemistry, physics The total pressure of a mixture or gases is the sum of the partial pressures of each gas in the mixture; it is only true for ideal gases.
2. n. chemistry When two elements can combine to form more than one compound then the amounts of one which combines with a fixed amount of the other will have a simple multiple relationship.

WordNet 3.0

1. n. (chemistry) law stating that when two elements can combine to form more than one compound the amounts of one of them that combines with a fixed amount of the other will exhibit a simple multiple relation
2. 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