Water freezing point - ???

Water freezing point - ???
Water freezing point - ???
Anonim

Water… How much in this word. Sometimes you really want to correct the poet in this way! Indeed, water is synonymous with life. This statement is true for the inhabitants of the ocean coast, and for the inhabitants of the desert. The properties of water over the millennia of the existence of science have been studied up and down. It would seem that nothing is unknown, but … let's deal with such a seemingly simple parameter as the freezing point of water.

Freezing point of water

Everyone knows that the boiling point and freezing point of water are the key points chosen in 1742 by Anders Celsius to create his own temperature scale, later adopted in most countries of the world. But does water always boil at a hundred degrees and freeze at zero? No not always. There are a large number of parameters that can change these numbers. Let's start in order.

Firstly, the freezing point of water is zero degrees only whennormal atmospheric pressure, which is considered to be a pressure of seven hundred and sixty millimeters of mercury. As the pressure decreases, the freezing point of water increases and the boiling point decreases. With increasing pressure, everything is exactly the opposite.

Freezing point of s alt water

Secondly, the high s alt content makes the water more “resistant” to cold. The freezing temperature of the s alt water of the seas and oceans is about two degrees below zero Celsius. Those seas where the salinity is above average freeze at even lower temperatures.

The well-known natural water is a heterogeneous substance. Yes, the lion's share (more than ninety-nine percent) of water falls on that chemical compound, which is indicated by the formula H2O. But there is also the so-called "heavy" water, and even "super-heavy" water in the composition of natural water. In the first case, instead of two hydrogen atoms, the water molecule contains two atoms of its deuterium isotope, in the second case, tritium. Under normal conditions, the content of deuterium and tritium in water is too low to have a negative effect on humans or animals. But in its pure form, deuterium exhibits weak toxic properties. But tritium, being a radioactive substance, is simply dangerous in concentrated form. But, fortunately, in nature it is found only in a diffuse form.

Water freezes at a temperature

Tritium and deuterium water have physical and chemical properties that are different from ordinary, "our" water. Deuterium water freezes attemperature +3, 81 degrees Celsius (at normal atmospheric pressure), and boils at a temperature of +101, 43 degrees. For tritium water, these figures do not differ much: the freezing point is +1.25 and the boiling point is +101.6 degrees Celsius.

The properties of water, this seemingly simple chemical compound, have not yet been fully explored. The Japanese Masaru learned, according to him, even to talk with water. He believes that water responds to music and the energy contained in words. And even notes! This is supposedly clearly visible after freezing the water in the shape of the resulting crystals. Interestingly, water reacts the same way to a note with the words “you are a fool” and to playing compositions in the style of “heavy metal”, but the inscription “thank you” is associated with a series of works for harpsichord “Goldberg Variations” by Johann Sebastian Bach.

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