Non-Condensables Plus Water Vapor Mixture

Calculate the total weight of mixture to be handled when evacuating 25 pounds per hour of air from 28.5 inches vacuum with a mixture temperature at 80°F. Barometer = 30 inches Hg. 

The total fixed volume of a mixture of gases and vapors at a given condition is the same as the volume of any one component (gas laws), and its pressure is composed of the sum of the individual partial pressures of each component. 

This is also a frequent process situation. To determine the 70°F air equivalent, the non-condensable are determined as in Example 6-5 and the water vapor as in Example 6-2. The total for the mixture is the sum of these two values. 

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