The units of density depend on the units used for mass and volume. The most commonly used units are grams per cubic centimetre (g/cm³) or kilograms per cubic metre (kg/m³). These balloons are ...

Copper atoms are larger than aluminum atoms. There are fewer copper atoms than aluminum atoms in the cubes. Copper atoms are much more massive than aluminum atoms. The extra mass makes copper more ...

in a solid ‐ particles are tightly packed in a regular structure in a liquid ‐ particles are tightly packed but free to move past each other in a gas ‐ particles are spread out and move ...