Units of density

The idea

The SI unit of density is kilogram per cubic metre (kg/m³); for liquids g/mL and g/cm³ are also used, and 1 kg/m³ = 1 g/L.

Mass over volume

Density is mass divided by volume. Mass is in kg and volume in m³ in SI.

What is the SI unit of density?

• kilogram per cubic metre
• gram per second
• newton

Units of density

Press Next step.

Units follow mass and volume

The units of density depend on the units of mass and volume we take.

SI unit of density: kg/m³. For liquids also g/mL and g/cm³. 1 kg/m³ = 1 g/L.

• Quantity | SI unit
• Mass | kg
• Volume | m³
• Density | kg/m³

Notes

SI unit of density is kg/m³. Liquids: g/mL, g/cm³. 1 kg/m³ = 1 g/L.

Check yourself

The SI unit of density is …

For liquids, which of these units is also used for density?

1 kg/m³ is equal to how many g/L?

Answer: 1 g/L

1 kg/m³ = 1 g/L.

Gram per cubic centimetre is written …

• kg. Kilogram is the unit of mass.
• kg/m³ — correct. Yes!
• m³. Cubic metre is the unit of volume.
• N/m². That is the unit of pressure.
• m/s. That is a unit of speed.
• g/mL — correct. Yes!
• g/cm³ — correct. Yes!
• g/m³. That is gram per cubic metre.
• cm³/g. That would be volume per mass.