The Transfer of Heat

Energy Is the ability to make things move or change; all matter is made up of tiny particles or molecules

Molecules in Solids

Thermal Energy Is the energy of these particles moving; we feel this as heat Molecules are slower when cool. Molecules move faster when warm.

What happens when particles or molecules are heated/cooled? When molecules are heated they move faster and expand (spread apart); heated air or water becomes less dense (lighter) when heated When molecules become cooler they slow down and tend to compact (get closer), become more dense (heavier)

Molecules in Liquids

Water Molecules: Evaporation & Condensation

Molecules Expand & Contract

More about Matter http://studyjams.scholastic.com/studyjams/jams/science/matter/solids-liquids-gases.htm

Heat Transfer in Matter The movement of heat; heat always flows from a warmer object to a cooler one There are three ways heat transfer can happen: Conduction, Convection, and Radiation

Conduction Is the transfer of heat (thermal energy) between things that are touching

Conductors Materials through which heat can move easily; metals like iron, copper, and steel

Insulators Material that heat does not move through easily; plastic, rubber, wood, leather, glass, and ceramic Ceramic Tiles

Conduction

Convection Is the transfer of heat by the movement of liquids or gases

Convection

Convection

Radiation Is the transfer of heat energy by electromagnetic waves

Radiation

3 Types of Heat Transfer

3 Types of Heat Transfer