# Density

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.

## Density Equations

• Common Mean Densities
• Density
• vDensity
• Absolute Pressure
• Actual Head Rise of a Pump or Fan
• Air Density Behind the Shock Front
• Archimedes number
• Buoyancy Equation
• Density
• Density of Lumber
• Ecuación de Flotación
• Generic Weight Calculation
• meanDensity Lookup
• Sand Density
• Sand Weight
• Snow Water Density (SWD)
• Snow Water Equivalent (SWE)
• Snow Weight - Area
• Snow Weight - Area (polygon)
• Snow Weight - Area (rectangle)
• Void Ratio
• Weight of Lumber (Volume)
• Weight of Wood Boards