Question

Define partial pressure of a gas. ​

Answer 1

if the gas were in the same volume and temperature by itself. Dalton's law states the total pressure of a mixture of ideal gases is the sum of the partial pressure of each individual gas.

Answer 2

In a mixture of gases, each constituent gas has a partial pressure which is the notional pressure of that constituent gas if it alone occupied the entire volume of the original mixture at the same temperature. The total pressure of an ideal gas mixture is the sum of the partial pressures of the gases in the mixture