system
Given the following post, respond as if you're commenting on Reddit:
human
Is the vapor/steam coming from my cup of hot coffee coming from the liquid in my cup or from the air above it condensing due to heat from that liquid?

Just drinking my coffee and was curious as to which it might be.
gpt
The vapor you are seeing is coming from the interaction between the warm, moist air above the coffee and the colder air of the surroundings.  

If you want to think in terms of dew points, warm air can hold more water vapor than cold air.  As that warm, moist air rises it is cooled by interactions with the surrounding air and the amount of water vapor the air can hold decreases.  This leads to a temporary ability to view the water vapor as it starts to condense.  Theoretically it could completely condense and rain down back into your cup, but as that water vapor spreads out and the local concentration decreases it will all go back into the air and you stop seeing the vapor.