Dalton's Law of Partial Pressures

(1) According to this law, “When two or more gases, which do not react chemically are kept in a closed vessel, the total pressure exerted by the mixture is equal to the sum of the partial pressures of individual gases.”

Thus, P_total = P₁P₂ P₃ + ……..

Where P₁P₂ P₃ are partial pressures of gas number 1, 2, 3 .........

(2) Partial pressure is the pressure exerted by a gas when it is present alone in the same container and at the same temperature.

Partial pressure of a gas

(3) If a number of gases having volume P₁P₂ P₃ at pressure P₁P₂ P₃ are mixed together in container of volume V, then,

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