When calibrating a Celsius liquid-in-glass thermometer, two standard fixed points are marked on the stem. Which of the following defines these two fixed points under standard atmospheric pressure?
The temperature of melting pure ice and the temperature of steam above pure boiling water
The temperature of a mixture of salt and ice, and the temperature of boiling water
The lowest and highest temperatures that the thermometer is physically capable of measuring
The standard room temperature and the average human body temperature
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.