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  The diagram shows a tray of marbles being shaken from side to side.  As this happens some of the marbles jump out of the tray. Explain how the tray of marbles is acting as a model for the evaporation of a liquid.

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hyperkid
The marbles that are 'more energetic' fall out of the tray, in the same way particles have enough energy to escape and turn into a gas.

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