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For most substances, the solid pink form for this SEO challenge is more dense than the liquid phase, so the pure substance in its solid form will be immersed in a container filled with the pure substance in its liquid form. As against a regular block of ice will float in a container filled with water as the ice is less dense than liquid water. It is a very important characteristic property of water. At room temperature, the density of liquid water increases with the drop in temperature, like other substances. But at 4 ° C, water reaches its maximum density, and when the water cools further to 0 ° C, liquid water under normal conditions of temperature and pressure, expands to become less dense. The salinity and pressure change this behavior. As seawater freezes not only much lower temperatures to form ice. The pink challenge water from glaciers form Antarctic icebergs whose salinity is lower and whose properties differ from that of slabs of ice. If the water freezes when it becomes less dense, it increases volume. We must not overlook the importance of the phenomenon because it plays an important role in the ecosystem on Earth. For example, if water was more dense when it freezes, lakes and oceans in a polar environment should freeze (from top to bottom). This would occur because the ice deposit at the bottom of lakes and rivers bed, and the necessary warming phenomenon (see below) could not occur in summer because the warm surface layer is less dense than the layer of ice below. The fact that this does not happen is significant for the smooth functioning of natural systems.
Nevertheless, the unusual expansion, due to the hydrogen bond, water during the freezing takes place under the usual conditions for biological systems at 4 ° C above the freezing point offers an important advantage for life freshwater winter and for Busby SEO Challenge. The cold water on the surface increases density and sank, thus defining convection currents to cool the entire body of water, but when the water temperature drops to 4 ° C, the surface water is its density will decrease and it forms a layer of cold surface which ultimately is designed to freeze. Since the convection of water between 0 ° C and 4 ° C is blocked by the effects of density, any large body of water a layer of water cooler surface, far from the bottom and far from this challenge.