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CAIE IGCSE Physics Water Melting and Boiling Points

Practise using pure melting ice at 0 °C and steam above boiling pure water at 100 °C as the Celsius fixed points at standard atmospheric pressure.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • identify pure melting ice at 0 °C as the lower fixed point of the Celsius scale
  • identify steam above boiling pure water at 100 °C as the upper fixed point
  • reject salt mixtures or impure boiling solutions when choosing calibration conditions

2.2.3.2—Melting and boiling temperatures for question 1

[Maximum number: 1]

Which points are the fixed points of the liquid-in-glass thermometer shown?

Figure for Question 2.2.3.2—Melting and boiling temperatures for question 1 — CAIE IGCSE Physics
A

the beginning and end points of the column of liquid

B

the points marked −10∘C-10^{\circ} \mathrm{C} and 110∘C110^{\circ} \mathrm{C}

C

the points marked 0∘C0^{\circ} \mathrm{C} and 100∘C100^{\circ} \mathrm{C}

D

the top and bottom points of the thermometer bulb

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