Heat Transfer

1
Heat Transfer Convection Currents
2
Heat

• Heat moves from areas of warmth to areas of cold
• Three ways heat can be transferred
• Radiation
• Conduction
• Convection

3
Radiation

• Transfers energy through
• infrared waves (sun or fire)
• Can move through EMPTY space
• No direct contact between heat source and an
  object.
• Example bonfire warming your face

Heat from a bonfire is an example of radiation
Heat given off from a light bulb is also a form
of radiation
4
Conduction

• Transfers heat through DIRECT CONTACT of
  particles (solid to solid)
• Example bare feet on hot pavement

A spoon heating up in a pot of soup!
The pan gets HOT because it is touching the HOT
burner on the stove!
5
Convection

• Transfer of heat through the movement of FLUIDS
  and GASES
• Example soup heating inside a pot
• Movement is created by differences in DENSITY
• Hot things less dense rise to the top
• Cold things more dense fall to the bottom

6
Convection

• Example Lava Lamp

Cools off! more dense fall to the bottom
Hot! less dense rise to the top
7
Convection currents

• Convection currents occur in Earths mantle
• These currents are the force behind the movement
  of Earths plates