Final answer:
The pressure contributed by a single gas in a mixture of gases is referred to as partial pressure, as defined by Dalton's law of partial pressures.
Step-by-step explanation:
The pressure contributed by a single gas in a mixture of gases is known as partial pressure. This is a concept from Dalton's law of partial pressures, which states that the total pressure in a gas mixture is the sum of the individual partial pressures. When multiple gases are present in a mixture, each gas contributes to the total pressure proportionally, based on the pressure it would exert if it were the only gas present at the same temperature and volume.