Why do biscuits get soggy in hot tea faster than cold tea?
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Water is made up of lots and lots of little pieces that we call *molecules*. Each molecule in a liquid or gas (like water or like air) is always moving around, all the time. The hotter the liquid (or gas), the faster its molecules are moving.
Because the molecules are moving faster in hot water, they go further into the biscuit, faster. Also, because they’re moving faster, it’s harder for the biscuit’s structure to slow them down, just like a car going fast can crash through a barrier more easily than a car going slowly.
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Because cold tea gets poured away before biscuits can get anywhere near it!
In all seriousness though, hot liquid has more energy as the molecules move faster, this accelerates the breakdown of the molecular bonds maintaining the structure of the biscuit
Heat is a catalyst which means it has more potential energy, it speeds up chemical processes. More energy=faster response time. Less energy=sluggish response time.
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