How it’s calculated
Density is mass per unit volume. Any one of the three quantities follows from the other two.
Example: a 270 g block that displaces 100 cm³ of water has ρ = 270 ÷ 100 = 2.70 g/cm³, which matches aluminum.
Units are converted for you: 1 g/cm³ = 1 g/mL = 1,000 kg/m³ ≈ 62.43 lb/ft³.
Frequently asked questions
What is the density of water?
About 1.00 g/cm³ (1,000 kg/m³) near 4 °C, and about 0.997 g/cm³ at 25 °C.
What is specific gravity?
The ratio of a substance's density to that of water. It has no units: aluminum is about 2.7.
Does density change with temperature?
Yes. Most materials expand when heated, so density falls slightly. Gases change a lot with temperature and pressure.
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Sources
- Chemistry 2e, §1.4 Measurements (density) — OpenStax
- SI Units — U.S. National Institute of Standards and Technology
Formulas are taken from the free public references above. Results are provided “as is” for informational and educational purposes only. See our disclaimer.
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