Conduction

Convection

Radiation

AIMS

To understand the process of conduction

To understand the process of convection

To understand the process of radiation

CONDUCTIONOccurs in solidsTransfer of energy by a substance without the substance itself movingEnergy is transferred to cooler parts of the piece of metal, vibrating particles pass on their extra vibrational energy to neighbouring particlesMetals are very good conductorsNon-metals poor conductors

Solids are made of particles called atoms and molecules, when energy as heat is absorbed by a solid the particles move around their position in the solid more.

CONVECTION

Occurs in liquids and gasesTransfer of energy by the movement of liquids or gasesCurrents occur in liquids and gases, their particles move faster when they are hotWarm regions rise up through colder regions and the colder regions replace the warmer

The liquid or gas is warmed

Heat rises

The heated fluid moves in bulk to a cooler region and takes the heat with it

RADIATION

Transfer of energy by wavesDoesn’t need particlesMost of our energy comes from the sun.It must travel by radiation because there are no particles between the sun and EarthThe hotter the object the more energy is radiated

Radiation Investigation

Black card and silver foil

Two thermometers

Lamp

Clamps and stands

Stopwatch

Sellotape one thermometer to the card and one to the foil

Place the lamp equal distance between the two

Switch on the lamp and take temperature recordings every minute for 10 minutes

Objects with dark, rough surfaces absorb most of the radiation and become warm/hotObjects with light coloured, shiny surfaces reflect most of the radiation and will remain coolerHouses in hot countries are often painted white why?

AIMS

To understand the process of conduction

To understand the process of convection

To understand the process of radiation

HOMEWORKMAKE A MODEL HOUSE

Your design can be varied

It must have 2 levels, upstairs and downstairs, and a roof.

You can use whatever material you like

Clingfilm for windows, fabric for the floors, loft insulation