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GCSE physics- Heat radiation

meggyloulou11 physics Inglés 10 fichas

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1Heat energy can be transferred by conduction, convection and radiation.Heat radiation if the transfer of heat energy by infrared radiation.
2Conduction and convection involve the transfer of heat energy by particles.Conduction is the main form on heat transfer in solids
3Convection if the main form of heat transfer in liquids and gases.Infrared radiation can be emitted by solids liquids and gases.
4Any object can absorb and emit infrared radiation, whether or not conduction or convection is taking place doesn't matter.The bigger the temperature difference between a body and its surroundings, the faster energy is transferred by heating.
5Infrared radiation is emitted from the surface of an object.You can feel infrared radiation if you stand near something hot like a fire or recently parked car bonnet.
6—hot objects, cool surroundings emit more than absorb(cool down)
Cool objects, hot surrounding absorb more(warm up)
7—The hotter an object is, the more radiation it radiates in a given time.
8dark matt surfaces absorb infrared radiation better than light shiny surfaces.light shiny surfaces reflect infrared radiation
9—solar hot water panels contain water pipes under a black surface, the heat is absorbed and warms the water in the tank.
10—light and shiny objects reflect IR radiation and dark matt surfaces absorb it!!