molecules are accelerating during boiling.
What is molecules ?
a groups of atom which bonded together with respect to the small fundamental unit of a chemical compound that can take part in chemical reaction.
Boiling is like evaporation can change a substance from a liquid to gas . As the liquid is started heating they move around faster and liquid is absorbed heat.
When the liquid start to boil, bubbles of vapour form and rise as gas molecules.
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