conduction + evaporation

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