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CAIE IGCSE Physics Evaporation and Particle Escape

Practise explaining evaporation as higher-energy particles escaping from a liquid surface, leaving a lower average kinetic energy in the remaining liquid.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • state that evaporation occurs at the surface and can happen below boiling point
  • identify the faster, more energetic particles as those most able to escape
  • link the lower average kinetic energy of particles left behind to a temperature decrease

2.2.3.4—Evaporation in terms of the escape of question 1

[Maximum number: 2]

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

Describe the process by which the volume of water in the puddle decreases.

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