That water covers three-quarters of the planet's surface and that all living beings are made up of a very high percentage of water, has been said many times. The first statement is easy to believe for anyone who has traveled by boat or has discovered the immensity of the ocean from an airplane; To believe the second, on the other hand, we need a good dose of faith in science because it is not something obvious.
Water occurs, in its natural state, not only in a liquid form but also in a solid (ice) and gaseous (water vapor) form. To study the differences between these different states of water we propose a couple of experiments.
Take a tray that is commonly used in the freezer to make ice cubes.
Fill the different receptacles to different levels and mark them with a permanent marker. Leave one nearly empty, one-half full, and one filled to the top edge. Put it in the fridge freezer and wait until it freezes.
What do you notice about the level of ice in each container?
Surely you have ever seen a frozen lake in winter; Why do you think that only its surface freezes? What advantages does this have for life in rivers and seas?
That cold water is denser / less dense than hot water.
Once your experience is over, try to remember some phenomena related to water in a liquid state that can be explained based on what you have just observed. Think, for example, of ocean currents.
How do you think the movements of the great ocean currents that circulate from the poles towards the equator can be explained from the difference in densities between warm and cold water?
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