When food is left out unsealed why do crunchy thing go soft while soft things get hard?
In: Other
If you leave something sitting out, it will gradually absorb or lose moisture until it reaches the same moisture content as the surrounding air.
So if you take something dry such as a cracker, it starts out less moist than the air, so it will absorb moisture from the air and get soft and soggy.
If you take something moist like a slice of cake, the air will such the moisture out of it and dry it until it reaches the same (dry) moisture content of the air.
So a soggy cracker and a dry slice of cake will actually be the same moisture content of you leave them out, just we expect one to be moist and one dry, so they both feel wrong.
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