Science Questions

Does water weight less when it's boiled?

Sun, 1st Nov 2009

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Question

Les, Catfield asked:

Does water weigh less when itís boiled? My kettle feels lighter when water is boiled than when itís cold.

Answer

Well, Les, if your kettle is open at the top than it would have evaporated a bit of water so it may have lost weight purely through evaporation but if the kettle is a sealed unit then E=MC2 says, If you add energy to the kettle when itís hot, therefore, it should weigh slightly more than the waterís hot than the water is cold.

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