PHYSICS 10 SCIENCE · 2026–27 · Textbook brain teasers · p. 12

Textbook brain teaser

If evaporation produces cooling, why does boiling water not feel cold?

تبخیر ٹھنڈک پیدا کرتی ہے تو ابلتا پانی ٹھنڈا کیوں محسوس نہیں ہوتا؟

Solution & explanation

Evaporation removes energy from the remaining liquid. During sustained boiling a heater continually supplies energy; at fixed pressure the liquid stays near its boiling temperature while that energy supplies latent heat. Cooling is an energy-removal effect, not a claim that any evaporating liquid has a low temperature. Never test boiling water by touch.

Independent study material · English-medium textbook p. 12 · Original book ↗