Common glass, which has a density range of 4.67 to 5.43 slugs per foot cubed, has a unit weight range of 150.25 to 174.7 pounds per foot cubed. Unit weight, more commonly known as specific weight, measures the weight of material per unit of volume.

Unit weight can be found by multiplying the density of a material by its gravitational acceleration, which on Earth is approximately 32.174 feet per second squared. The density of glass differs depending on its type, which causes a wide unit weight range. The upper range of the unit weight of glass is similar to that of aluminum, which has a specific weight of 172 pounds per foot cubed.