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:
Make the drink warm
Change the cup so that the outside surface isn’t cold
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.
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.