If you ask a person a question: "At what temperature does water freeze?", The more often we hear the answer that at 0 degrees Celsius.However, this is not always the case.For example, if slow cooling, distilled water, it does not turn into ice even at several points below zero.But if it put a small piece of ice, it instantly starts to freeze, "germinating" long crystals.This process is associated primarily with the features of the flow of crystallization.To convert H2O into solid impurities and requires a non-uniform particles of dust, air bubbles ... just pure liquid devoid of support centers, therefore, determining the temperature at which water freezes (distilled), to consider the above factors.In laboratory conditions able to reduce the liquid temperature to 70 degrees.
Moreover, according to their chemical nature and position in the periodic table, H2O should solidify at a hundred degrees below zero.However, it is not subject to most of the physical and chemical laws, which can be applied to other substances and compounds.The fact is that the interaction of water molecules is unusually large, so you need a special, intense thermal molecular motion to overcome the attraction.This is evidenced by this fact, the sharp rise in temperature and the boiling point.
interesting when asked about the temperature at which water freezes, is the fact that, under certain conditions, the hot liquid can freeze faster than cold.But the prerequisite for this is the fact that it must go through certain temperature level during freezing.This phenomenon was discovered by Aristotle, but in 1963 a schoolboy E. Mpemba proved that the hot cream mixture freezes faster than cold.All matter has appeared that the greater the difference between hot water and cold air masses, the more intense heat is exchanged, and, accordingly, hot water begins to rapidly cool.
An interesting and scientific basis to answer the question "at what temperature is frozen ocean water."Typically, this process starts at minus two degrees.However, the more salt in water, the lower the required temperature so that the liquid is frozen.Thus there is no specific freezing point.With an average salinity of 35 percent of the freezing temperature of - 1.9 degrees.At that time, when ice formation starts, a large percentage of salt remains in the water, from which lowers the freezing point.
As we can see, temperature conversion of H2O ice is quite wide.This fact applies to other fluids.For example, determining at what temperature freezes alcohol, you can get an answer that at -115 degrees.That is why it is used in fluids, de-icing and used as antifreeze.
Thus, answering the question "at what temperature the water freezes," you can be sure that the answer depends on many factors.And at the moment the majority of the paradoxes found a scientific explanation.