Mass per unit volume expressed in grams per cubic centimeter for solids and liquids, and usually as grams per liter for gases. Densities of some common substances follow:
g/cc
g/L
sulfur
2.06
aluminum
3.7
sodium
0.967
glycerol
1.27
water*
1.0
chlorine
3.214
carbon dioxide
1.977
air**
1.293
oxygen
1.429
hydrogen
0.0899
*Basis of comparison for solids and liquids. **Basis of comparison for gases. For discussion of density vs. specific gravity, see specific gravity. Apparent density is the mass of a unit volume of powder, usually expressed in grams per cubic centimeter, determined by a specified method (MPA definition, MPA Standard 9–50T). Bulk density is an alternative term for apparent density.See Current Density.