Why is evaporation different from boiling?
AEvaporation is a surface phenomenon happening at any temperature (water molecules at the surface escape); boiling occurs throughout the liquid at a specific temperature (the boiling point)
BEvaporation only occurs at high temperatures
CBoiling is slower than evaporation
DThey are identical processes
Answer & Solution
Correct answer: A. Evaporation is a surface phenomenon happening at any temperature (water molecules at the surface escape); boiling occurs throughout the liquid at a specific temperature (the boiling point)
Evaporation: surface phenomenon, occurs at all temperatures, only surface molecules with enough energy escape. Boiling: bulk phenomenon, occurs at one specific temperature (boiling point), bubbles of vapour form THROUGHOUT the liquid. Wet clothes dry by evaporation (no boiling needed); cooking water boils at 100 °C.
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