A student entry to http://www.studyskillshandbook.com.au Visit http://www.enhanced-learning.net for all your study skills needs!

1. Science Summary For...
Solids, Liquids & Gases.
By Ashwini

2. 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.

3. 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.

4. 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 liquid
Sublimation- A solid to a gas or gas
to a solid

5. 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.

6. Density
What’s density?
Density is how closely packed matter is. Water
always has a density of 1cm /g.
Calculating density
D = M
V Example: Mass = 128
Volume= 245
Density= 128
245= 0.52244 cm /g
3
So density equals mass divided by volume.
3

7. 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.

8. Finished Topic!