this post was submitted on 27 Jul 2025
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To explain: Air has water gas in it, when the gas hits something colder than it there is a chance it'll get stuck and be liquid for a while. The colder the thing, or the more gas in the air (relative humidity) the the more that'll happen.
So you have 2 knobs you can twiddle: Make the surface less cold or the air less wet. Good luck with the second one, so on the first:
Under changing the cup you have insulated cups (vacuum thermoses are very good) or wrapping the cup in an insulator especially a slightly absorbent one like neoprene beer cosies.