Steam is formed at 100°C but I see “steam” being produced at less than that temperature. What is that and why isn’t it steam?
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Lets make this question more precise – “I’m heating water in a pot on the stove, with a thermometer submerged in it, and seeing visible evaporation prior to the thermometer showing 100c. Why?”
There are dozens of reasons here, because of the imprecision of your experiment, the variables of altitude, ambient temperature, humidity, and more.
Lets just take one – liquids being heated do not heat evenly. This is a particular problem in precision chemical reactions, which is why stirring, pebble beds, etc, are part of patented processes.
So you really can’t even say that the visible evaporation you’re seeing isn’t from 100c water, never mind the other variables that would cause it
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