One should always cover a pan while heating (Slideshow version)

One should always cover a pan while heating : Photo of step #26

Stage 5/5 :

The result is shown more clearly in the diagram: the temperature of the uncovered pan in red and that of the covered pan in green.

Remarks

False: The time difference is too small to be significant. It really doesn't matter whether the pan is covered or not.

And to drink?

We are going to heat 1 litre of water in an uncovered pan and measure the time it takes to boil , then another litre in a covered pan, heated and measured in the same way.

Comparing these times will tell us if it is really necessary to cover the pan.

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