You just tested the density of different temperatures of water! The first time, the cold, blue water sank into the red, warm water. We saw purple water through both glasses. This is because the ...

Food coloring. Blue and yellow work well. (Or another dark and light color.) One cup of cold water (below 50. You could add ice to chill the water.) One cup of hot water (the hot water faucet in ...

You should have seen the hot red water stay towards the top of the container, while the cold blue water sank towards the bottom. Hot water is less dense than the surrounding water, so it tends to ...

In the hot (yellow) water, the water molecules are slightly further apart than in the cold (blue) water. The hot water is less dense and floats on the cold water. When the cold water is placed on top, ...

We go in that water. It’s probably 56 degrees. It’s not the coldest water in the world currently being swum, not “My Octopus Teacher” cold — that ... deep blue and tropically turquoise ...

A lover of winter swimming takes a bath in the Baltic Sea at night under a full moon. The renewed cold-water craze that, apart from its daring quality and the ‘simple’ thrill of immersing ...