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Year 9 Matter

Year 9 Science NZ Matter

TermDefinition
Expansion When a substance takes up more space, because its particles have moved further apart. This happens when a substance is heated.
Evaporating Changing from a liquid into a gas.
Matter A substance that occupies space and has mass.
Gas A type of matter in which the particles are far apart. It will fill (or escape) its container.
Melting Changing from a solid into a liquid.
Sublimation Changing directly from a solid into a gas.
Condensing Changing from a gas into a liquid.
Solid A type of matter in which the particles are packed tightly together. It cannot be poured and does not take on the shape of its container.
Solidifying Changing from a liquid into a solid.
Liquid A type of matter in which the particles can slide past each other. It can be poured and will take the shape of the bottom of its container.
Particles The very small parts which make up a substance.
Contraction When a substance takes up less space, because its particles have moved closer together. This happens when a substance is cooled.
Diffusion When particles in a liquid or gas move from where they have a high concentration to where they have a low concentration.
Density How tightly packed together the particles are in a substance.
Created by: nztcowen
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