Someone tells me that on humid days, sweat that makes skin feel sticky or damp is mostly just condensation and not actually sweat. But that sounds like BS, because body temperature is almost always going to be hotter than ambient temperature, so condensation can’t form.
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You’re right. A surface collects condensation when its temperature is below the dew point of the air around it. For example, in 80F (27C) air with 75% humidity, your skin would need to be below 71F (22C) for condensation to even begin to form on it. With the help of something cold you might be able to get the outer layer of your skin below dew point in very warm humid weather, but it wouldn’t last long enough between the heat of your body and the air around you to actually contribute significantly.
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