As someone else commented, steam from boiling water is water vapor. Steam is invisible until it comes off enough to condense, at which point it’s basically mist.
Mist from a mister is just water droplets in the air. Beware that mist will cool you off, but steam will burn you terribly, as the water vapor loses lots of energy when it condenses, and it loses it into your skin if it’s touching you.
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