About John Dalton
John Dalton was English. He is known mainly for the development of the atomic theory, but he also came up with the Partial Pressures Law. He stated that in a mixture of gases, all of the pressures of the gases are separate, and add up to the total pressure in the room. Dalton did his own work to form this law. He used a test of absorbing water vapor into the air. An example of Dalton's Partial Pressure Law in action is when you are inflating a balloon with different kinds of air. When you blow it up, you are putting in Nitrogen, CO2, and Oxygen. The balloon still inflates just the same as if you put one of those gases in. This means that each gas has its own pressure.