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Dalton's Law, also known as Dalton's Law of Partial Pressure, states that the total pressure exerted by a gasteous mixture is equal to the sum of the partial pressures of each individual component in a gas mixture. This law was observed by John Dalton in 1801 and can be related to the Ideal Gas Law.

The relationship below provides a way to determine the volume based concentration of any individual gaseous component. where: is the concentration of the ith component expressed in ppm.