First Children Encyclopedia

227

Freezing

Icicles are spikes of ice

that form when dripping

water freezes. You often

see them on trees in

winter. If water keeps

dripping down and

freezing, the icicle will

get longer and longer.

Changing states

Melting

chocolate

Because the warmth of your mouth makes it melt.

Melting

When you don’t eat your

ice cream quickly enough,

it melts and changes from a

solid to a liquid! Chocolate

melts too, and makes

your hands all sticky.

Most solids will melt if the

temperature is high enough.

Evaporating

In the open air, water slowly turns into

vapour – this is called evaporation.

Wet clothes dry on a line because the

water they hold evaporates.

Washing dries faster on a hot day,

when heat turns water into vapour

very quickly.

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230-231 Molecules
232-233 Reactions
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