Standard Science Primary 4 Matter

What is the difference between boiling and evaporation?

A Boiling occurs throughout the liquid; evaporation only at the surface.
B Boiling is a slow process; evaporation is fast.
C Boiling occurs at all temperatures; evaporation only at fixed point.
D Evaporation involves heat gain; boiling involves heat loss.
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Worked Solution

Step 1: Boiling occurs only at the boiling point and throughout the liquid. Step [2-9]: Evaporation occurs at any temperature below the boiling point and only at the surface. Step [2-9]: Option 3 correctly identifies the spatial difference.

Correct answer: Boiling occurs throughout the liquid; evaporation only at the surface.

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