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//Variable declaration:
P = 14.7 //Absolute pressure of air (psia)
MW = 29 //Molecular weight of air (lb/lbmol)
T = 75+460 //Temperature in Rankine scale (°R)
R = 10.73 //Universal gas constant (ft^3.psi/lbmol.°R)
//Calculation:
p = P*MW/R/T //Density of air (lb/ft^3)
//Result:
printf("The density of air at 75°F and 14.7 psia is : %.4f lb/ft^3",p)
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