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Hey Johnny,

When a substance is melted, its molecules gain energy (due to the increase in heat) and due to this energy the molecules move faster (increased velocity). This is why solid paraffin wax becomes liquid - the molecules have more kinetic energy and are thus moving around more. When cooled, the molecules lose energy and move slower - the wax becomes solid. 

This is a very brief answer to your question but its an overview of the kinetic theory of particles. Please message me if you want a detailed explanation and we can talk it through!

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