Science Summary

Science Summary For...Solids, Liquids &

Gases.

By Ashwini

What’s Matter?

Matter is anything that has mass or takes up space.

What’s a Particle Model?

A model is used in science to make theories easier to

understand.

States And Phases

Matter is divided in to 3 main groups called a state or phase. They are:

Solid- in this particles are strongly bonded together. A solid is

incompressible meaning it can’t be pressed together.

Liquid- in this, the particles have a weak bond and it is compressible.

Gas- in a gas, the particles have no bond at all.

Changes of State A state can change into another state.

This happens by particular changes. These changes are:

Melting- a solid to a liquid Freezing- a liquid to a solid

Evaporation or Vaporisation- a liquid to a gas

Condensation- a gas to a liquidSublimation- A solid to a gas or gas

to a solid

Expansion

What’s expansion & what causes it?Expansion is when the particle models expand

causing they’re stat to expand. Expansion is caused by heat. When the models are

heated, they rapidly move against each other causing expansion. Contraction is the

exact opposite of expansion.

Expansion occurs in liquids, rather than solids and gases.

DensityWhat’s density?

Density is how closely packed matter is. Water always has a density of 1cm /g.

Calculating densityD = M V Example: Mass = 128

Volume= 245 Density= 128 245= 0.52244 cm /g

3

So density equals mass divided by volume.

3

Density… continued

If a object has lower density than a liquid, it floats in the liquid. If it has

higher density than the liquid, it sinks in the liquid. If it has the same density, it

stays in the middle.

Ice has less density than water.Salt water is more dense than pure

water.

Finished

Topic!