Part 3 of 3

What changes the rate of evaporation

identify / explain

Try it yourself

identify: name or select. explain: give reasons and connect them to evidence.

A pupil wants to find out whether moving air speeds up evaporation from towel B. She does one run in still air and one with the fan on. Which things must she keep the same in both runs? Choose all that apply, then explain why.

Choose all statements you think are correcta.The mass of water on towel B at the start (3.00 g)b.The starting temperature of the water in the tubes (70 °C)c.How much of the towel is open to the aird.The time of each run (5 minutes)e.Whether the fan is onf.The reading on balance B at the end

Why must these stay the same?

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Scope and sources

Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.

Melting and boiling, with the melting and boiling points of water at standard atmospheric pressure (2.2.3.1, 2.2.3.2); condensation and solidification in terms of particles (2.2.3.3); evaporation as the escape of more energetic particles from the surface of a liquid (2.2.3.4); how evaporation causes cooling of a liquid (2.2.3.5); the differences between boiling and evaporation (2.2.3.6); how temperature, surface area and air movement over a surface affect evaporation (2.2.3.7); how the cooling of an object in contact with an evaporating liquid happens (2.2.3.8). Specific heat capacity is in SHC01; conduction, convection and radiation are in TRANS01.

Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.

Official Cambridge syllabus