Dalton's Law

Dalton derived the law of partial pressures from his work on the amount of water vapor that could be absorbed by air at different temperatures. It is therefore fitting that this law is used most often to correct for the amount of water vapor picked up when a gas is collected by displacing water.

A real life example of this would be you putting CO2 and Helium into a container and measuring the pressure. You are going to get the total pressure, not jus the pressure of one of them.

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