A student investigates the boiling point of a pure liquid. She heats the liquid slowly and records its temperature from the moment it starts to boil until it has completely turned into gas.
Which statement is correct?
The temperature decreases as the liquid boils.
The temperature fluctuates up and down as the liquid boils.
The temperature stays the same as the liquid boils.
The temperature increases continuously as the liquid boils.
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.