Density

Density is a term used in physics and engineering to describe the mass of an object per unit volume. It is a fundamental concept in the study of matter and is used in a variety of scientific and engineering disciplines.

Definition

In physics, density is defined as mass per unit volume. It is usually represented by the Greek letter rho (ρ). The formula for density is:

ρ = m/V

where:

• ρ is the density
• m is the mass
• V is the volume

Measurement

Density is typically measured in kilograms per cubic meter (kg/m³) in the International System of Units (SI). However, it can also be measured in grams per cubic centimeter (g/cm³) or pounds per cubic foot (lb/ft³) in the Imperial system.

Applications

Density has many applications in science and engineering. For example, it is used in fluid dynamics to calculate the buoyancy of objects, in material science to determine the properties of materials, and in geology to study the Earth's crust.

See also

• Mass
• Volume
• Buoyancy
• Fluid dynamics
• Material science
• Geology

References

• 
  Density column showing different liquids stacked by density.
• 
  Water density metric conversion chart.
• 
  Graph of air density versus temperature.
• 
  Molar volumes of liquid-solid phase of elements.