why do teabags swell up and get full of air when I’m pouring hot water onto them?

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why do teabags swell up and get full of air when I’m pouring hot water onto them?

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Anonymous 0 Comments

The air is already in the bag mostly. It’s being displaced as the tea leaf sucks up water. The space between individual particles of tea leaf is a lot of air. That air has to go somewhere as the leaves slurp up moisture. To some degree it’s possible you’re trapping a little steam depending on how hot your water is.

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