The density of a material is defined as its mass per unit volume. The symbol of density is ρ (the Greek letter rho). Formula Mathematically: » ho = frac left (0.9975 ight ) , where: » ho is the density of the composite material, in g/cm3 and » W_a is the weight of the specimen when hung in the air W_w is the weight of the partly immersed wire holding the specimen » W_b is the weight of the specimen when immersed fully in distilled water, along with the partly immersed wire holding the spe… (More on Density)