Understanding Density
Density measures how tightly matter is packed into a given space. Heavier, dense materials like gold and lead have high mass per unit volume.
Convert density units including kilograms per cubic meter, grams per cubic centimeter, pounds per cubic foot, and pounds per gallon.
0.01 Gram per Cubic Centimeter
Density measures how tightly matter is packed into a given space. Heavier, dense materials like gold and lead have high mass per unit volume.
Density conversions are used in civil engineering to calculate structural soil compaction, aerospace weight budgets, and fluid buoyancy.
Air at sea level is ~1.225 kg/m³, Water is 1,000 kg/m³ (1 g/cm³), Concrete is ~2,400 kg/m³, Aluminum is ~2,700 kg/m³, and Gold is 19,300 kg/m³.
Because substances expand when heated and compress under pressure, gas and liquid density values often specify temperature (e.g. at 20°C standard ambient).
Density is the mass of a substance divided by its volume (Density = Mass / Volume). In the metric system, the SI unit is kg/m³.
At 4°C, pure liquid water has a density of approximately 1,000 kg/m³, 1.0 g/cm³, 1.0 g/mL, or about 8.34 lb/gal (US).
Multiply the value in g/cm³ by 1,000. For example, steel at ~7.85 g/cm³ is equal to 7,850 kg/m³.
Density is an absolute measurement with units (e.g. kg/m³), whereas specific gravity (relative density) is dimensionless, comparing a material's density directly against water.
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