
You are absolutely right. I was actually taking the angle that the 'same amount' of water weighs the same no matter what temperature. Density and weight aren't the same thing. In other words, if you take two equal amounts of water, heat one up and cool one down (assuming that the water is heated to sub-boiling temperatures, so none is lost to evaporation), they are still gonna weigh the same.
Conversely, if you take an exact volume of hot water, and the same exact volume of cold water, the cold water is going to 'weigh more' because there are more water molecules fitting into the same space.
Leave a comment: