Organisms live in fresh water bodies.

Vidminno

It does not exceed 0.1%, in the form of a bet or ice is called fresh.

The mountainous massifs in the polar regions and ice fields contain most of the earth's fresh water. Moreover, fresh water flows in rivers, streams, fresh lakes, and also in gloomy lakes. At different times, the percentage of fresh water in the Earth's water content becomes 2.5-3%.

• About 85-90% of fresh water reserves are located near ice.
• Due to the obstructed waterways, which are expanding, population growth and the development of new territories are facing challenges
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fresh water. What to reach: desalination of sea water, including desalination of sea water condensation of water vapor from the wind, from the vicinity of clay sea water;

condensation of water vapor in the storage tanks in the cold, zokrema - natural walks, such as the ovens near the coastal cliffs.

The remaining method

creates great things natural reserves fresh water in coastal areas of a number of countries, which has recently been discovered.

Layers of fresh water sometimes go under the seabed, and through cracks in impenetrable balls there are fresh springs.

The temperature of fresh water becomes so high that it is necessary to release refrigeration units that retain cold water by condensation.

The distribution of fresh water along the earth's basin is uneven.

Europe and Asia, where 70% of the world's population lives, have less than 39% of river waters.

2010 .

Russia is in the greatest position in the world for surface water resources. fresh water - Natural water with mineralization up to 1 mg/l.

Russia is in the greatest position in the world for surface water resources. Vocabulary of geography - - EN freshwater Water contains relatively low mineral content, generally not containing 500 mg/l from cut solids.

(Source: LANDY) EN bathing freshwater Freshwater in some bathing is explicitly authorized and in some bathing is not protected and is traditionally practiced by a large number of bathers. Water... Adviser of technical translation

Vaporizers, desalination plants.

P. Water has always become an item of prime necessity on ships for sea voyages, and even a top priority for drinking water.

At this time, the expansion of P. water on new ships has resulted in a great deal of practical knowledge.

Encyclopedic dictionary F. Brockhaus and I.A. Efrona

O.V.Mosin Types of fresh water All the Earth's known reserves of fresh water are becoming depleted of a small part of the total amount of water. The stench comes from the evaporation of water from the oceans and from the surface of the land, as well as from the leaves of plants. Water vapor that accumulates in the atmosphere is carried by the global circulation of the atmosphere to other geographic latitudes, where it falls in the form of rainfall or snow.

The water that falls from the fallfalls runs into rivers or collects in lakes and underground reservoirs. Vreshti-resht will evaporate or be carried by rivers back to the oceans. Approximately 10% of fresh water is used for household consumption, which is used for consumption rural dominion and industry. To hold one pound of corn, about 200 liters of water are required, to soak one pound of grain (with the removal of litter) 700 liters of water, and to hold one pound of synthetic gum 1200 liters of water. The increased wastage of water for household consumption is driving down the growing population, while the number of such everyday adjustments.

After the water has been drained, it is necessary to treat it again, so that it does not pollute the lakes and rivers where they flow.
The importance of treating sewage and waste waters after their industrial waste is now obvious, as much of the waste water is subject to high levels of waste, as stinks are removed from the sea and oceans. Fresh water is divided into two groups: primary water

and mineral. Between the skin groups, the water varies greatly behind the warehouse due to geological and geographical features. This classification is valid for natural waters, but in addition to them, there are artificial waters created by humans either directly or as outlets sovereign activity.

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They contain single-piece mineral waters, desalinated water (sea water) and distilled water, as well as special waters infused with one or another component, for example, river water. As for rare exits, the stench is represented by evil and sewage water

Primary fresh water Fresh water rivers and lakes vary by chemical warehouse

. These values ​​originated from the beginning and are associated with the climatic zone and the peculiarities of the locality in which the water reservoir is located. Water is a universal destroyer, which means that its abundance of minerals lies in the soil and rocks that lie beneath it. In addition, the water is fragile, and therefore, fallout, snow melting, and tributaries that flow into a large river or lake flow into its warehouse., which is accompanied by progressively absorbed organic substances: coal, water, sour, nitrogen, sour and phosphorus, which are located in bio-folding streams, are converted into CO2, H2O, NO3-, SO42-.

ta phosphati.

Oxidative reactions that occur in water sometimes reduce the strength of the dissolved acid to the level, but it is impossible to avoid the destruction of aerobic bacteria.

In the minds, the process of decomposition of anaerobic bacteria is formed, which results in the formation of products such as CH4, NH3, H2S and PH3.

The quantity of dissolved sour, necessary for all biodegradable organic wastes in drinking water, is called biochemical requirement for sour (BOD).

BOD shows the prevalence of water by organic pollutants.< 7 - кислая среда;
The standard test for such organic compounds is a five-day BOD test.
When testing, the fermented water is diluted with distilled distilled water to ensure excess sourness, and the quantity of the dissolved sour in the extracted mixture is preserved.

Ts Dusty Vazhlivi Forms is not a tilki for the drive, Ale for people's organism, the acidic balance of the Yako is guilty of vitrimuvati in the melodious framework: the allowance of the validity of the pH to become 7.38 to 7.42 I can not be allowed to get into 10% of the cigent DIAPAZON.

At pH = 7.05, a person falls into a precomatose state, at pH = 7.00, coma occurs, and at pH = 6.80, death occurs. The pH of the human body is preserved by the so-called buffer products of physiological fluids (meat, blood, lymph and tissues), which include carbonate and phosphate buffers. Hardness is the power of water, combined with calcium ions Ca2+ and magnesium Mg2+.

Harshness is determined by a special technique described in GOSTs

I'll drink some water

The units of measurement are moles per cubic meter (mol/m3) or millimoles per liter (mmol/l).

There are several types of hardness - carbonated, carbonate, non-carbonate, natural and non-overheated; It’s more common to talk about the burning hardness associated with the total concentration of calcium and magnesium ions. The organoleptic characteristics of water include its smell, taste, color and turbidity. The smell, color and taste of water

The smell of water
indicate (earthy, chlorine, smell of petroleum products, etc.) and evaluate the intensity of the smell on a five-point scale (zero indicates
permanently available
smell):
A very faint, almost unnoticeable smell;

- the smell is weak, noticeable only because of an outburst, as if it were brutalized by a new respect;- the smell is easily noted and does not sound laudatory about the water;

- the smell is offensive, attracts respect and makes you tired of drinking;- the smell of the bedding is strong, making the water unsuitable for use.

Taste the water.

The skin has its own GDC - a limiting permissible concentration, such that it does not cause harm to our body. Russia is in the greatest position in the world for surface water resources. There are also words, viruses and bacteria, for which the GDC is equal to zero, so they are not to die when near water.

Liquids and microflora may be present in water, but in such an insignificant concentration that they cannot be detected by the most subtle and precise methods of analysis. On the edge of the sea water,.

Place even a small amount of salts in your warehouse.

It does not matter in what form the water is found (rare, solid - ice, or gas-like - steam), as long as the salt concentration in it does not exceed 0.1% - such water is classified as

fresh

The polar ice caps have the greatest reserves of fresh water. Fresh water creates fresh lakes, rivers and streams. The proportion of the total world supply of fresh water in relation to the total amount of water on the planet will become less than 3%.

What is important is the large supply of fresh water (over 90%) enclosed in the Antarctic ice. Why is it that fresh water is inexhaustible? Self-replenishment occurs as a result of the natural circulation of water in nature.

River water has one very important feature - it cleans itself. Through natural biochemical reactions and processes that continuously occur in river waters, the concentration of polluting substances is regulated and their quantity changes. The water resources available to people are determined by the fluidity of their self-renewal.

Polar ice go through the entire renewal cycle in 8 thousand years, in the oceans this process proceeds with much greater fluidity. In continental bodies of water, such as seas, lakes, etc., the self-renewal of water is 500 times shorter than the same process for the ocean.

The rivers have the most rapid water supply: their renewal cycle is between 10-12 days.