Practise explaining evaporative cooling as energy leaves liquid, cloth or skin, lowering the temperature of what remains with CAIE IGCSE Physics questions and mark schemes.
In an experiment, cold water is poured into a bowl made of an insulating material. The container is placed in a draught-free room. After several hours, the volume and the temperature of the water are found to have decreased.
Name and describe the process that causes the decrease in the volume of the water, and explain why the temperature of the water decreases.
Evaporation
Molecules with higher/highest (kinetic) energy OR that gain enough energy
escape (from the liquid surface)
Molecules remaining in liquid have low / lower (kinetic) energy
OR Energy for evaporation came from remaining liquid