By the end of this lesson you will By the end of this lesson you will know: know:

what a what a ‘‘materialmaterial’’ is is what we mean by what we mean by ‘‘propertyproperty’’ what the properties of solids, liquids and what the properties of solids, liquids and

gases aregases are

Materials Materials Everything is made Everything is made

from some sort of from some sort of ‘‘materialmaterial’’

Materials are made up Materials are made up of lots and lots of tiny of lots and lots of tiny pieces pieces

These tiny pieces are These tiny pieces are known as particlesknown as particles

Solids, liquids and Solids, liquids and gases are all made of gases are all made of lots of particles lots of particles

PropertiesProperties

The property of a material tells us The property of a material tells us something about what it is like…something about what it is like…

Materials may be hard, soft, shiny, roughMaterials may be hard, soft, shiny, rough

Can you think of any more? Can you think of any more?

SolidsSolids

A solid is something that we can holdA solid is something that we can hold A solid keeps its shape, unless we cut it or A solid keeps its shape, unless we cut it or

shape it ourselves shape it ourselves In a solid, all of the particles are packed In a solid, all of the particles are packed

together very tightlytogether very tightly

Liquids Liquids Liquids are runnyLiquids are runny They can be poured They can be poured The particles are less tightlyThe particles are less tightlypacked, so they can move about packed, so they can move about If poured from one containerIf poured from one containerto another, they will take the to another, they will take the shape of their new containershape of their new container

Gases Gases

The particles in gases have lots of room to The particles in gases have lots of room to move move

Gases are all around us Gases are all around us They spread into all of the empty places They spread into all of the empty places

they can they can Most are invisibleMost are invisible

SOLIDS GASESLIQUIDS

The molecules are held together with strong bonds. They don’t move very easily so SOLIDS can keep their own shape and size

The molecules are free to move around. They can spread around an open space quickly and freely. GASES can’t keep their shape unless they are kept in a sealed container.

The molecules have weaker bonds. They can move around slightly so LIQUIDS can flow. They can’t keep their shape unless they’re in a container.

An example – water An example – water Water can be a solid, a liquid or a gasWater can be a solid, a liquid or a gas When it is cold it is solid – When it is cold it is solid – ICEICE When it is at room temperature it is a liquid – When it is at room temperature it is a liquid –

WATERWATER When it is hot it is a gas – When it is hot it is a gas – STEAMSTEAM

Now you have learnt about the properties of Now you have learnt about the properties of solids, liquids and, make a list of all of those solids, liquids and, make a list of all of those you knowyou know