Gas as in water vapor (sorry if this was unclear)
In: Physics
If by “gas” you mean steam. Steam is composed mostly of water that has gotten hot enough to turn into vapor. But you can’t actually see water vapor – its completely invisible. What you’re seeing is small amounts of water vapor that has cooled off enough to turn back into liquid water, but which is now stuck in the column of rising steam coming off of the pot.
The hotter the stove that the pot is on, the hotter the water vapor coming off of the pot will be. Hotter water vapor = less cooling off and turning back into liquid water = less visible steam.
When you turn the stove off the temperature of the steam drops. This means that more water in the steam is cooling off and turning back into liquid water, making the steam more visible even though there is now less of it.
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