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Heat by Mind Map: Heat
0.0 stars - reviews range from 0 to 5

Heat

Heat transfer

Radiation

Electromagnetic wave, Can travel through a vacuum

Matt black - best absorber and emitter

Shiny silver - worst absorber and emitter

Conduction

Energy transferred by particle collisions, Gases worst conductors becaues particles are far apart, Solids best conductors because particles joined togeter, Metals best conductors because of free electrons

Convection

Only happens in liquids and gases, Fluid expands, becomes less dense so floats upwards causing a convection current

House insulaton

Loft insulation

Fibres trap small pockets of air. Air is a gas so is a very poor conductor

Very cheap to install - pay back time about 1 year

Cavity wall insulation

Bubbles in the foam trap small pockets of air

Pay back time about 2 years

Most effective method of insulation

Double glazing

The air trapped between the two layers of glass is a very poor conductor

Very expensive - pay back time 10 to 20 years

Least effective method of insulation

Cooling

Temperature

The greater the difference in temp between the object and its surroundings the faster it transfers heat and cools down

Surface area

The greater the surface area of an object the faster it transfers heat so the faster it cools down