Why do some foods step soft and some knotty?

why do crisps and biscuits go soft when exposed to nouns but bread and rolls go frozen?

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Answers:
Maybe its something to do with relative humidity.Crisps are intensely dry , so they take on marine from the air.Bread is more humid , so it dries out .No belief really , good give somebody the third degree

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Wow what a mind bender....good examine.

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I'm thinkin its the moisture content of the food.

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