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When pressing coffee, why does total volume of boiling water and coffee appear to decrease after grounds are pressed to bottom?

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  • $\begingroup$ I’m voting to close this question because it is not a question about physics $\endgroup$
    – John Rennie
    Commented Sep 9, 2020 at 15:38
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    $\begingroup$ I think this is a great physics question. If you want to add some jargon, you could talk about "packing of granular media", but the physics is the same with or without the lingo. $\endgroup$
    – pwf
    Commented Sep 9, 2020 at 16:12

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the ground coffee contains air, so you press the air out.So it's not a physic question, but just knowing, what a sponge does.

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