Thermal Energy and Heat

1
Thermal Energy and Heat
2
Thermal Energy

• The total energy of all of the particles in an
  object

3
Heat

• The transfer of thermal energy from the object
  with higher thermal energy to the object with
  lower thermal energy

4
Transfer of Thermal Energy

• Conduction
• Convection
• Radiation

5
Conduction

• Thermal energy is transferred from one particle
  of matter to another without the net movement of
  matter

6
Conductors

• Conductors transfer thermal energy well.
• Metals such as silver and stainless steel, tile
  floor

7
Insulators

• Insulators do not transfer thermal energy well.
• Wood, wool, paper, gases in air

8
Why does the metal spoon feel colder than the
plastic spoon (hint theyre both at room
temperature)?
9
Convection

• Transfer of energy by the movement of currents
  within a liquid or gas

• This creates a circular motion called a
  convection current

10
How does the thermal energy from the sun get to
us if theres no gas or liquid in space (hint
Not by conduction or convection)?
11
Radiation

• The transfer of energy by electromagnetic waves
• Does not require matter to transfer energy
• All the suns energy that reaches Earth travels
  through millions of kilometers of empty space