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Rate of Heat Transfe

where is heat energy from an object radiated from? the surface
The bigger the surface area... the more infrared waves that can be emitted or absorbed by the surface
why do car engines have 'fins'? they increase the surface area so heat is radiated away quicker, so the engine cools quicker
what type of materials transfer heat away more quickly? objects made from good conductors
why is a vacuum flask double walled with a vacuum between the 2 walls? to stop all conduction and convection through the sides
why are the walls either side of a vacuum silvered? to keep heat loss by radiation to a minimum
why is the bottle supported using insulating foam? it minimises heat conduction to or from the outer glass bottle
why is the stopper made of plastic and filled with cork or foam? to reduce any heat conduction through it
why do the hairs on your skin 'stand up'? to trap a layer of insulating air, this limits the amount of heat loss by convection
why do some people go pink when they get hot? because your body diverts more blood to flow near the surface of your skin so that more heat can be lost by radiation
Created by: rv1