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