What is the relationship between g/cm³ and kg/m³?

They differ by a factor of exactly 1000: 1 g/cm³ equals 1000 kg/m³. Water is 1 g/cm³ or 1000 kg/m³. The two columns are the same physical density expressed in the two common engineering unit systems.

How do I find a part's mass from its volume?

Mass equals density times volume. With density in g/cm³ and volume in cm³ the answer is in grams. A 50 cm³ aluminium part at 2.70 g/cm³ weighs 50 times 2.70, which is 135 grams.

Why do densities vary for the same material?

Alloy composition, temper, moisture, and porosity all shift density. Wood densities in particular depend heavily on moisture content and species, so table values are typical figures rather than exact constants.

Which is the densest common metal here?

Among everyday engineering metals, lead at about 11.3 g/cm³ and gold at 19.3 g/cm³ are the densest listed, while magnesium at 1.74 g/cm³ is the lightest structural metal. Tungsten, at 19.3 g/cm³, rivals gold.

Can I use these for buoyancy or fluid calculations?

Yes for a first estimate. Liquid densities here are at roughly room temperature; they fall as temperature rises, so for precise hydraulic or buoyancy work use a value at your actual operating temperature.

Material Density Reference

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Density turns a geometry into a mass and underpins buoyancy, stress, and cost estimates. This reference lists typical densities for metals, plastics, woods, ceramics, and liquids in both common unit systems, and converts a volume into a part mass.

How it works

Density is mass per unit volume. The table gives each material in grams per cubic centimetre and the identical figure in kilograms per cubic metre — the two differ by exactly 1000:

kg/m^3 = g/cm^3 * 1000

To estimate a part’s mass the tool multiplies the chosen density by the volume you enter:

mass (g) = density (g/cm^3) * volume (cm^3)

So a 50 cm³ aluminium bracket at 2.70 g/cm³ has a mass of 50 * 2.70 = 135 g.

Tips and notes

Listed values are typical: alloy, temper, moisture, and porosity all shift real density, and wood especially varies with species and moisture.
For fluids, density falls as temperature rises — use a value at your operating temperature for precise work.
Magnesium (1.74) is the lightest structural metal here; lead (11.3) and tungsten (19.3) are among the densest.
Keep volume and density in consistent units; mixing cm³ with kg/m³ gives a result off by a factor of a million.