I'm a pretty impatient person so having to boil a pot of water can seem like an eternity to me. To compound this issue I would never use a lid! What I realized is that water will boil faster with the lid on because there is a reduction in heat loss (and all kinds of other nerdy thermodynamics stuff going on). How much faster? Let's do a little experiment shall we.
2 pots (same size)
1 cup of water in each pot
1 stove (pots put on same sized burner)
1 BlackBerry acting as a timer
1 adult who acts like a kid
Pot with the lid - 2 minutes 5 seconds
Pot without the lid - 2 minutes 30 seconds
So not a huge difference but keep in mind that I boiled only 1 cup of water. The difference in time when boiling a full pot of water will be more significant. And in the world of boiling water 25 seconds is a lifetime when you are standing there watching it.
How does this relate to the environment? If you are boiling water quicker you are using less energy to heat that water.
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