Bitesize Page 6 P1.1

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The bigger the difference between the heat of the object and it's surrounding, the bigger the rate at which heat energy is transferred

Other things that affect the rate are...

Surface area and volume

Material

Nature of the object

Small animals have a large surface area compared to their volume

They lose heat to their surroundings alot so they have to eat alot to replace the energy lost

Large animals have a large volume compared to their surface area

They lose heat slowly and may over heat

Elephants have large ears with a large volume which allows heat to be transfered to their surroundings helping the animal cool

Car radiators are flat with many small fins to provide a large surface area

House radiators are thin and flat and have large fins so heat is transferred to the heat quickly

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