Water has a specific heat capacity of 4200 J/(kg∘C)4200\text{ J}/(\text{kg}^\circ\text{C})4200 J/(kg∘C) and a boiling point of 100∘C100^\circ\text{C}100∘C.
State what is meant by boiling point.
A mass of 0.25 kg of water at its boiling point is poured into an aluminium container which is initially at 17∘C17^\circ\text{C}17∘C. After a few seconds, the temperature of the container and the water are both 92∘C92^\circ\text{C}92∘C.
Calculate the energy transferred from the water.
Calculate the thermal capacity of the aluminium container.
Water from the container evaporates and the temperature of the remaining water decreases slowly. Explain, in terms of molecules, why evaporation causes the temperature of the remaining water to decrease.
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.