Just wondering - if you have one of those cups of coffee with a lid on it, how much of the liquid would evaporate (assuming reasonable figures for the size of the cup and temperature of the liquid or whatever other variables are relevant)? Since it's essentially a sealed container, I'd assume there'd have to be some kind of equilibrium reached. What kind of figure would you be looking at in terms of the heat that the liquid loses to the air? Is this a big factor in the overall loss of heat from the coffee compared to conduction and radiation? Thanks in advance!