During a strenuous mountain climb, a hiker's body sweats to regulate temperature. When they reach the windy summit and stop to rest, the sweat on their skin evaporates.
Use ideas about particles to explain why the evaporation of sweat cools the hiker's skin.
To prevent cooling down too quickly in the cold wind, the hiker wraps themselves in a silver, shiny foil survival blanket.
Suggest why the hiker might cool down dangerously fast at the summit if they do not use the survival blanket.
Explain how the shiny foil survival blanket reduces heat loss from the hiker's body.