A student calibrates a liquid-in-glass thermometer to establish a Celsius scale. Which of the following defines the standard lower and upper fixed points used for this calibration?
The temperature of dry ice and the temperature of boiling saltwater.
The temperature of melting pure ice and the temperature of steam above pure water boiling at standard atmospheric pressure.
The lowest and highest temperatures the thermometer liquid can withstand before changing state.
The average room temperature and the normal 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.