The pressure exerted by each individual gas in a mixture is called its:

1. A mixture's gases each push independently unless they react. 2. Unless they chemically react with each other, the individual gases in a mixture do not affect each other's pressure. 3. The pressure exerted by each individual gas in a mixture is called its partial pressure. 4. Adding those partial pressures gives the total pressure of the mixture. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 9 'Gases', sections 9.1-9.6_