1. Transferring Thermal Energy!

2. Conduction Transfer of thermal energy by direct contact During collision, kinetic energy of faster moving particle transferred to slower particle Slower particle speeds up and faster particle slows down Eventually temperature is the same everywhere

3. Heat Conductors Solids are the best conductors of heat Particles are close together Solid metals are very good conductors Move electrons easily Why are most cooking pots made of metal (but the handles are not)?

4. Convection Transfer of energy in a fluid by movement of the particles from one place to another Movement is due to density Density = mass / volume As temperature increases, volume increases, and density ?

5. Convection Currents Flow of material up from heated area to cool area, then sink back down Convection is very important to Earth’s climate

6. Atmospheric Circulation

7. Radiation Transfer of heat by electromagnetic waves Electromagnetic waves are light Heat is radiated by infrared waves

8. Electromagnetic spectrum We can measure wavelength and frequency of a wave Wavelength: λ Frequency: f For any wave: V= fλ

9. Electromagnetic Spectrum

10. Radiation When a wave strikes matter, some is: Reflected (bounces off) Transmitted (passes through) Absorbed (taken in)

11. Controlling Heat Flow Insulators: Materials that do not let heat move easily Some materials insulate from convection, some from conduction, some from radiation

12. Good Insulators