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I was just thinking today...I've always been told that a covered pot boils faster than an open pot. But, I've never tested it.It would make a pretty simple science experiment. One might have to test it a couple of times.Now, the question... WHY?
What I believe the function of the lid is that it increases the partial pressure of water vapor above the water, which decreases the amount of water evaporating off of the top of the pot.As water evaporates, it cools the water. By increasing the partial pressure above the water, it would decrease the cooling effect from evaporation.However, it may be difficult to discern the difference between simply retaining heat vs retaining water vapor.
Not quite.The boiling point is based on the pressure of the system, and not the concentration of water vapor above the liquid.
A loose cover will have no effect on absolute pressure but will clearly increase the partial pressure of water vapor above the liquid by preventing mixing with ambient air. But most importantly it reduces convective and radiative heat loss from the surface.And yes, it does.
A covered pot will always boil faster than an open pot UNLESS you are watching it, in which case it will never boil. sorry, someone had to say it