The term would be partial pressure.
The partial pressure of a gas refers to the amount of pressure contributed by the gas to the overall pressure of a non-reacting gas mixture.
For example, if a gas is formed from a mixture of two gases A and B. The pressure of the gas would be the sum of the pressure of A and that of B. The pressures that A and B contribute to the overall pressure of the gas are called the partial pressures of A and B respectively.
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