During a summer gathering, a copper mug containing a beverage is wrapped in a wet paper towel to cool it down. Evaporation cools the water in the paper towel.
Explain, in terms of molecules, how evaporation cools the water in the paper towel.
As the water in the paper towel cools, so does the copper mug. Explain how free electrons transfer thermal energy through the metal of the mug.
301 exam-style questions on CIE IGCSE Physics 2.3 Transfer of thermal energy, covering 2.3.1a Thermal conductors and thermal insulators, 2.3.1b Explaining thermal conduction, 2.3.2 Convection, 2.3.3a Thermal radiation, 2.3.3b Surface colour and texture, 2.3.3c Rate of emission and absorption of radiation, and 2.3.4 Consequences of thermal energy transfer. Each one has a worked solution and a mark scheme showing where the marks go.