An athlete finishes a workout and has a layer of sweat on their skin. When they stand in front of a fan in a warm room, they feel a distinct cooling sensation. Which of the following statements best explains why they feel cold?
The air from the fan is at a much lower temperature than the room.
The sweat evaporates rapidly, absorbing thermal energy from the skin.
Only the least energetic water molecules escape from the sweat, lowering the temperature of the remaining liquid.
The airflow from the fan causes water vapor in the surrounding air to condense onto the skin.
528 exam-style questions on CIE IGCSE Physics 2.2 Thermal properties and temperature, covering 2.2.1 Thermal expansion of solids, liquids and gases, 2.2.2a Internal energy and temperature, 2.2.2b Specific heat capacity, 2.2.3a Melting, boiling, condensation and solidification, 2.2.3b Evaporation, and 2.2.3c Cooling by evaporation. Each one has a worked solution and a mark scheme showing where the marks go.