Slab building boards contain 17% moisture by weight. They are dried to a water content of 1% by weight by circulating hot air over them. The fresh air contains 0.017 lb of moisture per pound of dry air. The exhaust air contains 0.075 lb of moisture per pound of dry air. How many cubic feet of fresh air at standard conditions must be used per ton of the building boards?

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.