energy transfer by heating

infrared radation
1. can be used for cooking
2. can be used for commucation signals.
  1. mobile phones.
3. The hotter an abject is the more infrared radation it emits.
  1. Black,dark matt surfaces are good emitter of infrared radation.
    1. infrared radation doesn't involve particles
    2. can travell though a vaccum
    3. this how we get enrgy from the sun.
4. cannot see infrared radation with the naked eye.
5. can somtimes be found in burgular alarms.
6. apart of the electromagnetic spectrum.
7. Lighter, white shiny surfaces are good reflectors of infrared radation.
solids, liquids and gases.
1. convection.
  1. only occurs in fliuds (liquid and gases)
    1. less particles in fluid so the convection currents flow through.
  2. only works due to the current ( convection current)
    1. they can be on a very small scale.
    2. such as heatin hot air above land.
  3. fiuld rise when they are heated.
  4. fliuds rise due to convection (by heating)
    1. Water molucules,
    2. can happen onshore and off shore.
2. conduction.
  1. metals are the best conductors.
    1. The particles in the metal(because its a solid) virbrate faster and faster to create heat. (sometimes they expand)
      1. Gains kinetic enrgy.
    2. more parties in solid that are all ready to together virbarating fast
      1. whereas liquids have more space to fill to get hotter.
        poor conductors are called insulators.
  2. metals contain lots of free electrons, hwne sa metal is heated the electrons virbrate fastter and collide with other to pass on the energy.
    1. collides with other particles to pass on the enrgy.
      1. Happens because they're are free elctrons.
  3. non metals are poor conductors because they contain no free electrons.
3. Evapouration.
  1. The effects of the rate of transfer:
    1. (1) surface area (2) temperature (3) draught temperature and spped of draught.
      1. can effect how fast or slow the enrgy transfer is.
      2. Takes place between the most energetic liquid molecules.
      3. less kinectic energy when happening.
  2. Water molucoles escape and reach the air.
    1. because hot air rises.
      1. temperature decreases.
4. solid particles are tightly compact together. (vibrating)
  1. liquid particles(there are less) move around more
    1. gas particles (even les) are mcing around freely
      1. convection used these two.
      2. density of gas i much less than a solid or liquid.
  2. Best conductors because of this.

Next up

energy transfer by heating

Description

Resource summary

Similar

	Created by bethpowell98 almost 11 years ago