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Very interesting!

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Do you think that a liter of cold water weighs the same as a liter of hot water?

A liter of cold water will weigh more than a liter of hot water. Most liquids, not all, become heavier as they grow colder. The answer all boils down, nay cools down, to density. The colder the water is, the denser it is. Density will normally determine the weight of two liquids which have the same volume. It is quantified by mass divided by volume and here on our planet Earth, mass is the same as weight. In the case of water, aka H2O, the weight is measured by the number of H2O (2 parts hydrogen, 1 part oxygen) molecules present in a given volume.

So, assuming you have two bottles-each 1 liter-and you fill one with cold water and the other with hot, you will notice that the cold water bottle is a bit heavier than its counterpart. The reason is because molecules in hot water are spaced further apart and this means fewer molecules are present in any given volume, hence leading to less mass, or weight if you rather.  Now if we could just figure out a way to heat ourselves up…

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  1. Jen #

    I had literally stepped out of my sauna this morning, and decided to check emails while cooling down before hitting the shower. Laughed out loud while reading this blog while wiping away sweaty drips from my forehead, thinking this would be a good time to step on a scale and prove how much I don’t weigh! Then got to the last line of the blog and realized I wasn’t the only one having this wonderful female brainstorm–love being on the same page with my Cali chums! Hugs from the incredibly cold midwest, where I am now kinda wondering just how much more the frozen ice covering our lake weighs than when the water runs freely. :)

    February 10, 2014

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