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gas constant—The constant factor in the equation of state for ideal gases. The universal gas constant is  The gas constant for a particular gas is  where m is the molecular weight of the gas. For a mixture, the “molecular weight” is a weighted mean of the molecular weights of the components:  where m1, · · ·, mn are the molecular weights of the n gases, and f1, · · ·, fn are their masses relative to the total mass of the mixture. The gas constant for dry air is Rd = 2.870 × 102 J/(kg*K) The gas constant for water vapor is Rd = 4.615 × 102 J kg-1K-1
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