The Density of a substance is its mass per unit volume. It is also known as the volumetric mass density. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases. Increasing the temperature of a substance (with a few exceptions) decreases its density by increasing its volume.
Mean density, or more precisely, the mean volumetric mass density, of a substance is the average mass per unit volume of a substance in its most common or naturally occurring state. The vCalc symbol for mean density is `muD`. The standard units for mean density are kilograms per cubic meter. However, vCalc provides automatic conversions to other units via the pull-down menu including (lb/ft3) pound per cubic foot, (g/cm3) grams per cubic centimeter, (t/m3) metric tons per cubic meter, (ton/yd3): tons (U.S.) per cubic yard, (oz/in3) ounces per cubic inch. For a quick lookup of mean density of substances click HERE.