The Transfer of Heat
Mar 29, 2015
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 move faster
when warm.
Molecules are slo
wer
when cool.
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