To calibrate a liquid-in-glass thermometer on the Celsius scale, two standard fixed points are used. Which of the following describes these two fixed points under standard atmospheric pressure?
The temperature of melting pure ice (0∘C0^\circ\text{C}0∘C) and the temperature of steam above pure boiling water (100∘C100^\circ\text{C}100∘C)
The lowest and highest temperatures that the thermometer scale can measure (−10∘C-10^\circ\text{C}−10∘C and 110∘C110^\circ\text{C}110∘C)
The freezing point of water (0∘C0^\circ\text{C}0∘C) and the temperature at which water is warmest and densest (4∘C4^\circ\text{C}4∘C)
The average room temperature (20∘C20^\circ\text{C}20∘C) and the normal human body temperature (37∘C37^\circ\text{C}37∘C)
313 exam-style questions on CIE IGCSE Physics 2.2.3a Melting, boiling, condensation and solidification. Each one has a worked solution and a mark scheme showing where the marks go.