gc = 32.2 lbm-ft/lbf-sec2. R = 53.34 lbf-ft/lbm- ˚R. Kair = 1.395. Cp air = 0.240 BTU/lbm- ˚R. Cp water at 70EF = 0.998 BTU/lbm-˚F.
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