conduction + evaporation

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[physics
abikj18
Note by abikj18, updated more than 1 year ago
abikj18
Created by abikj18 over 9 years ago
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Evaporation-molecules in a liquid have a range of speeds-occurs at the surface-molecules with the most energy escaping from the surface - evaporation-Average ke (kinetic energy) of molecules remaining decreases and hence the temperature decreases-evaporation causes coolingFactors that affect the rate of evaporationThe rate of evaporation increases if you:-increase the temperature-increase the surface area-use a fan to blow air across the surface

Conduction-occurs in solids-generally, metals are good conductors and non-metals are good insulators-air is a very good insulator and is often used to stop conduction, eg. fleece traps air making a very good insulating layer.-other examples include sleeping bags, duvetsConduction in non-metals-When the end is heated, the atoms vibrate with greater amplitude (vibrate more)-They collide with neighbouring atoms and pass on some of the kinetic energy-heat is slowly transferred along the bar-same amount of electrons as atoms

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