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CAIE IGCSE Physics Cooling Objects by Evaporation

Practise explaining how an evaporating liquid cools skin, cloth or a container by taking energy from the object as higher-energy particles escape.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • state that higher-energy liquid particles escape from the surface during evaporation
  • track thermal energy from the contacted object into the liquid and escaping particles
  • link reduced average kinetic energy in the liquid to continued cooling of the object

2.2.3.8—Cooling of an object in contact with question 1

[Maximum number: 3]

Fig. 3.1 and Fig. 3.2 show how a puddle of water changes on a warm windy day.

Fig. 3.1

Fig. 3.1

Fig. 3.2

Fig. 3.2

Explain, in terms of molecules, how sweating helps to cool your body on a hot day.

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