John Dalton

While Dalton was studying the nature and chemical makeup of air, learned that it was not a chemical solvent as other scientists had thought. Instead it was a mechanical system composed of small individual particles that used pressure applied by each gas independently. His experiments on gases led to his discovery that the total pressure of a mixture of gases was the  sum of the partial pressures that each individual gas exerted while in the same space.  

Real life example: Can use to find the maximum concentration of liquid in gas phase

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