Definition
Density
Density tells how much mass is packed into a given volume.
What it means
Imagine two cubes that take up the same amount of space. The denser cube has more mass packed into that space. To calculate density, divide the mass by the volume.
Remember it
Same space, more mass means greater density.
Example
A clay block has a mass of 180 g and a volume of 60 cm³. Density = 180 ÷ 60 = 3 g/cm³. A same-size block with a mass of 120 g is less dense.
Watch for
Density is not mass alone: a large object can have more mass but lower density than a smaller object.
Common mix-up
Do not compare masses alone unless the volumes are equal; density uses both mass and volume.
Exact meaning
Mass density is mass divided by volume. It compares the mass of a material or object with the space it occupies, using units such as grams per cubic centimetre (g/cm³) or kilograms per cubic metre (kg/m³).