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For those who actually want to know why water left over night tastes bad, it’s because there’s dissolved gases in a fresh glass of water which contribute to the flavor. Letting it sit out lets it off-gas so it tastes stale.
This is similar to why coffee left out tastes stale. The aromatics off-gas changing the flavor.
Something about taste evolving to avoid stale water as it was breeding grounds for ucky yucky but I don’t have a source
I always though that the flavour compounds get oxidized in stale coffee, hence the taste. Also, wouldn’t offgassing occur in vacuum packed coffee as well? There’s got to be many VOC-s in coffee that can escape though, so I don’t know.
How? Sealed container wouldn’t release it to the environment.
Off gassing is escaping from the liquid coffee into the environment. If you have bought a sealed coffee in vacuum, it’s sealed! If you open the seal and walk away for a day to allow the off gassing…
So, it has to get in contact with air then? Wouldn’t that be a different phenomenon? I mean if coffee would just be releasing gasses on it’s own, wouldn’t the pack be puffy after a while? Keep in mind, I’m dull and thick as a brick.