Question

The density of air is 1.12 x 10-3 g/cm3.
a) what volume of air in cubic meters will have a mess of 1.00kg
b)express this density as lb/ft3.

Answer 1

(a) mass = density*volume, so
1.00 g = 1.12*10^-3 v
v = 0.8928g * 10^3 cm^3 * 1kg/1000g * (1m/100cm)^3
= 0.8928 * 10^-6 m^3

(b) 1.12 * 10^-3 g/cm^3 * 1lb/453.592g * (1ft/30.48cm)^3 = 8.72 * 10^-11 lb/ft^3

Answer 2

Express the density as lb/ft3.