If something seems light for its size (like a bag of cotton or pumice rock), then we say it has low density. Mass is the amount of matter in an object. Volume is how much space the object takes up.

The difference is mostly due to the fact that air is a gas and the water is a liquid, because density depends a lot on the state of matter. In a solid, the particles are tightly packed ...

The density of aluminium is 2.7 g/cm 3 – this means that 1 cm 3 of aluminium has a mass of 2.7 g. All matter contains particles. The difference between the different states of matter is how ...

Astronomers using the Very Large Telescope at the European Southern Observatory in Chile have imaged a filament of the cosmic ...

The size of the atoms and their mass has a lot to do with the density of the substance Another factor is how the atoms are arranged in the substance. Polyethylene is made up only of carbon and ...

Density in particular is an important property ... Physical properties vary with the amount of heat and the amount of dissolved matter contained in the water, as well as the ambient pressure.