The water vapor rises from the food and condenses as it mixes with the cooler air in your kitchen. The colder the air it mixes with, the more it condenses and the more visible it is. When the heater is going, as well as cooking your food, it’s also warming the air, causing it to rise above the burner. When the burner is turned off, the warm air column it was creating goes away, the water vapour mixes with cooler air and condenses more.
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