Heat
Transfer
CH 4 Prentice Hall
p.115-117
Heat
• The energy transferred from a hotter object
to a colder object.
– The hotter something is, the faster its molecules
are moving.
– Does ice have heat?
Heat Transfer
• Three ways it is transferred:
– Conduction
– Radiation
– Convection
Conduction
• Heat transfer by direct contact of particles of
matter
• Particles bump into each other and transfer
their energy heating them up.
Radiation
Climate
• The transfer of energy through empty space
• Moves in waves
– Sunlight
– Open fire.
Safety
Convection
• Heat transfer by the circular movement of
particles (liquids and gasses)
• Particles transfer heat
• Caused by differences in density.
How Convection Works
Density = Mass / Volume
• Heated Fluids:
– Move faster and bump into other particles
– They spread out increasing the volume
– Density decreases.
How Convection Works
• Cooling Fluids
– Move slower
– They come together,
decreasing the volume
– Density increases.
Convection Lab
Convection and Sea
The Ocean Floor
The Ocean Floor