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Convection P1

QuestionAnswer
Define convection. The process by which particles with more energy move from hotter regions to cooler regions, taking energy with them.
Explain how convection currents carry heat from a radiator round a room.(3) • Less dense hot air rises from the radiator • Goes to the roof and displaces hot air • Cool, denser air falls and fills gaps left by the hot air- goes back to the radiator
Part 1 Explain how heat is transferred through an immersion heater by convection.(5) Part 1 • Heat energy transferred to coils by conduction • Particles near the coils get more energy and start to move faster, becoming less dense • Hot water rises above dense cool water at the top of the tank and displaces it
Part 2 Explain how heat is transferred through an immersion heater by convection.(5) • Cool, dense water falls to the bottom of the tank • Cool dense water heated by coils
Why is convection most efficient in square/round containers? Because convection currents flow better
Why wouldn't you get hot water below the coils in an immersion heater? Because there is no conduction to the cold water
Created by: GuyBrazier