have a fixed shape anda a fixed volume.

have a fixed volume, but their shape can change

do not have a fixed shape nor a fixed volume

wood

matter

water

combustion

a physical change

a chemical change

it bigger. This is called expansion.

it gets smaller. This is called contraction.

it gets bigger. This is called contraction.

when a gas is cooled and changes into a liquid.

when a solid is heated and changes into a liquid.

when a liquid is cooled and changes into a solid.

air

an object

a substance

mass

volume

density

chemical change

expansion

physical change

condensation and solidification

physical and chemical changes

mixtures and evaporation