I would call that steam (definition 2b from m-w.com: the mist formed by the condensation on cooling of water vapor); even though it is most commonly associated with boiling, the word can be applied to any vapor created due to a heat differential.
I would call that steam (definition 2b from m-w.com: the mist formed by the condensation on cooling of water vapor); even though it is most commonly associated with boiling, the word can be applied to any vapor created due to a heat differential.