Solids, liquids, and gases are three states of matter. For each state of matter, describe the typical motion of the molecules.
An athlete's skin is wet with sweat after a race. After a short period of resting in a breeze, the sweat disappears.
State the name of the physical process that causes the sweat to disappear.
This process causes a cooling effect. Explain why this cooling effect occurs. Use your knowledge of molecules and energy in your response.
528 exam-style questions on CIE IGCSE Physics 2.2 Thermal properties and temperature, covering 2.2.1 Thermal expansion of solids, liquids and gases, 2.2.2a Internal energy and temperature, 2.2.2b Specific heat capacity, 2.2.3a Melting, boiling, condensation and solidification, 2.2.3b Evaporation, and 2.2.3c Cooling by evaporation. Each one has a worked solution and a mark scheme showing where the marks go.