This episode explains Dalton's Law of Partial Pressures, which states that the total pressure of a gas mixture is the sum of each gas's individual pressure. This works because, at the molecular level, each gas acts independently. The episode gives examples, including collecting a gas over water, where the total pressure must be corrected for water vapor pressure. It also introduces the concept of mole fraction, where a gas's partial pressure can be calculated by multiplying its mole fraction by the total pressure.
