In many cases different types of gases are mixed. This is true of the air around us. Air consists of nitrogen, oxygen, and a variety of other gases. We can use Dalton's Law of Partial Pressures to determine the pressure exerted by each gas in a given mixture, and the total pressure exerted by a mixture of gases. Dalton's Law of Partial Pressure states that a mixture has a total pressure that is the sum of its component, or partial, pressures.
Watch this video, which introduces Dalton's Law of Partial Pressures, and shows how to use it and the Ideal Gas Law to calculate the partial pressures of gases in a mixture.
Source: Khan Academy, https://youtu.be/zk3oogNrj1o
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