CAIE IGCSE Physics Applications of Thermal Expansion
Practise explaining useful and unwanted thermal expansion in thermometers, thermostats and structures and connect each design feature to its intended effect.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- explain how bulb volume and capillary width alter thermometer sensitivity and range
- identify constant bore and uniform liquid expansion as requirements for a linear scale
- use expansion gaps or sliding joints to prevent rails and bridges buckling when heated
2.2.1.2—Some of the everyday applications and question 1
Fig. 5.1 shows the structure of a liquid-in-glass thermometer.
Fig. 5.1
The bulb of the thermometer is placed into a beaker of warm water. As the liquid expands, it moves along the tube.
Question (a)
(a)
A second thermometer has a larger bulb that contains more of the same liquid than the thermometer shown in Fig. 5.1. It has a different scale. In every other way, it is identical.
[ 3 ]
Question (i)
(i)
Explain how the sensitivity of the second thermometer compares with the sensitivity of the thermometer in Fig. 5.1.
[ 2 ]
Question (ii)
(ii)
Explain how the range of the second thermometer compares with the range of the thermometer in Fig. 5.1.
[ 1 ]
Question (b)
(b)
State one everyday problem that is a result of thermal expansion.
[ 1 ]
Question (c)
(c)
Suggest and explain one way of solving this problem.
[Total: 10]
[ 2 ]
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