Why cotton candy dissolves in water.
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The sugar has to touch the water to dissolve. If you put a spoonfull of sugar in water, it dissolves really fast because all those tiny pieces of sugar spread out and each one gets to touch the water. If you put a solid chunk of sugar in water, like a piece of hard candy, it takes longer because the hard outside layer of sugar prevents water from touching the inside layers – so the water can only dissolve a little bit at a time.
Cotton candy is more like a spoonful of sugar than a solid piece, so the water touches all of it and it dissolves quickly.
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