about the project
Medical news
For authors
Licensed books on medicine
<< Previous Next >>

Physical properties of water (temperature, transparency, color, taste, smell) and the effect of these properties on human health.

These include smell, taste, color and transparency, that is, those properties that can be determined by the human senses. Turbid, dyed in any color or having an unpleasant smell and taste, the water is not sanitary-hygienic inadequate even if it is harmless to the human body. Deterioration of the properties of water adversely affects the drinking-water regimen, reflexively affects many physiological functions, in particular, the secretory activity of the stomach.

Transparency. This is an important indicator of water purity. Under the transparency of water is understood its ability to transmit light and make visible objects located at a certain depth. The transparency of water is determined by the amount of mechanical and chemical impurities contained in it.

The transparency of drinking water should be at least 30 cm, and the water of swimming pools - 20 cm.

Color. Drinking water should be colorless. The color of the water, like its turbidity, makes the water unpleasant to drink. Absolutely colorless water is rare, for example, in underground aquifers. In open reservoirs, water usually has one or another shade. A yellowish tint most often indicates the presence of iron salts or humic substances in the water. It is characteristic of the water of swamps. Microalgae give a greenish color to water.

Smell. Pure drinking water should not have any smell. Any smell indicates the presence in the water of either the biological decomposition products of plant or animal organisms, or any chemical compounds that are foreign to drinking water. Although sometimes this is only a consequence of the excess amount of sulfuric acid salts in the water, such as iron sulfide. This is most often characteristic of certain mineral waters. Phenolic, tar and other odors indicate a possible contamination of water by industrial wastewater, the smell of chlorine indicates excess concentrations of residual chlorine used to disinfect drinking water and water in swimming pools (above 0.5-0.6 mg per 1 liter of water).

Drinking water should not have extraneous smacks. The taste of water depends on its mineral composition, temperature, and the concentration of dissolved gases (oxygen and carbon dioxide). Boiled water is less tasty due to the loss of gases and bicarbonate salts of calcium and magnesium. Changes in the taste of water or the appearance of an unpleasant taste indicate the possible presence of organic substances in it, the decomposition products of various organic substances of animal or vegetable origin.

Temperature. The most favorable temperature for drinking water is +7 ... + 12 ° С. Such water more effectively quenches thirst, helps cool the mucous membrane of the mouth and esophagus and causes an increase in the activity of the salivary glands.

Reception of water, having a temperature of 5 ° C and below, leads to suppression of gastric secretion, indigestion. Very cold water can lead to local hypothermia of the nasopharynx and colds.

Water temperature is of great hygienic importance when bathing and swimming. In accordance with hygienic standards, water in indoor swimming pools (for adults) should have a temperature of +25 ... + 26 ° C, and for children - at least +26 ° C. Water temperature in natural reservoirs is not standardized.

Water temperature is one of the hygienic indicators of its quality. The deeper the aquifer lies below the surface of the soil, the less likely it is that various pollutants will enter it. This is explained both by the filtration of possible pollutants during their passage with surface waters through thick layers of the soil, and due to the presence of waterproof layers in the soil. At the same time, this is accompanied by a decrease in water temperature as the aquifer moves away from the soil surface and is defined as the constancy of water temperature at great depths. Water from deep underground aquifers always has a lower and constant temperature, it is cleaner than water from high-lying aquifers (located close to the soil surface).
<< Previous Next >>
= Skip to textbook content =

Physical properties of water (temperature, transparency, color, taste, smell) and the effect of these properties on human health.

  1. Human constitution, its effect on individual physical health
    Recommended reading: • basic 1. Valeologiya: ed. V.I. Bobritsko.- Poltava: 2000.-Part 1, Part 4. Additional 2. Kosovanova L.M., Melnikova M.M., Aizman R.I. Screening diagnostics of the health of schoolchildren and students. Educational-methodical manual. - Novosibirsk, 2003; 3.Vayner E.N., Volynskaya E.V. Valeology: Training workshop. - M.: 2002 4. Medical and biological foundations
  2. Physical properties
    In the study of physical properties, the quantity, texture, shape, color and smell of feces are evaluated. Macroscopically visible impurities are examined. The amount of excreted excreted per day depends on the composition and amount of food taken on the eve, can vary significantly. With a normal diet, the composition approaching trial diets, the daily amount of feces is 120-200 g.
  3. About the magical properties of water
    As you know, almost all living organisms and plants consist of more than 70% of water. Even in vegetable oil there is about 20% water. 80-90% of the mass of the grassy part of agricultural plants consists of water. Juicy fruits of plants also contain water: in potatoes its 80%; in tomato - 95%. Man consists of water October 8, 2003 The Royal Swedish Academy of Sciences awarded the Nobel
  4. Physical properties of air
    Physical properties of air include temperature, humidity, air mobility, atmospheric pressure, electrical condition, and solar radiation. Each of these factors has an independent value, but they have a complex effect on the body. When characterizing hygienic indicators of air, particular importance is attached to a set of physical factors, defined as climate. TO
  5. Mechanical and physical properties of the soil
    Soil temperature - determines the temperature of the surface layer of the atmosphere, as well as the thermal regime of the premises of basements and first floors of buildings. At a depth of 1 m, the soil no longer has daily temperature fluctuations. At a depth of 7-8 m, the lowest temperature remains in May, the highest - in December. It is of great sanitary importance for storing food in the basement, where in the summer
  6. The effect of physical and chemical parameters of air on human health and hygiene requirements for the air-thermal regime of school premises
    Optimal air conditions are an important factor in maintaining human health and performance. Adverse changes in the air can cause significant disturbances in the body: overheating or hypothermia of the body, hypoxia, the occurrence of infectious and other diseases, decreased performance. In a comprehensive hygienic assessment of air, the following are taken into account: - physical
  7. Physical properties of air
    The temperature on the earth ranges from -940С to + 630С. Temperature conditions depend on the latitude of the area: the farther from the equator, the sharper the angle of incidence, therefore, the earth heats less. On the surface (near the ground) the layers of air are warmer, every 100m the air temperature drops by 0.5 ° C. Thanks to the thermoregulatory mechanisms that are controlled by the central nervous system, man
  8. On the palate, on the color ...
    Let us honestly, hand on heart, answer the question: "What is food for you?" Upon reflection, someone will answer that for him it is the most important pleasure in life and at the same time a passionate hobby. Someone shrugs, because, from his point of view, food is just ordinary fuel: he threw it into the furnace and ran. In general, we can say that in relation to food people are divided into
  9. Physical properties of urine
    The amount of urine formation depends on air temperature, rest, sleep. The mechanism for reducing diuresis during sleep resembles that which occurs under the influence of the antidiuretic hormone of the posterior pituitary gland. Muscle exercises lead to a decrease in plasma renal output, which causes a decrease in sodium excretion. Heat reduces glomerular filtration, causing oliguria and also lowers excretion
  10. Physical properties of air
    1. Atmospheric pressure. As can be seen from the previous presentation of the material, the layer of air above the earth's surface extends to a height of about 1000 km. This air is held at the surface of the earth by gravity, i.e. has a certain weight. On the surface of the earth and on all objects located at its surface, this air creates a pressure equal to 1033 g / cm. Therefore, for the whole
    Inspection of arteries: In young people, at rest, a pulsation can be observed: 1. Carotid artery on the neck. 2. Truncus brachiocephalicus in the jugular fossa. 3. Connect the arter in the subhole. 4. Abdominal aorta. In older people, an additional definition of pulsating arteries: 5. Shoulder 6. Elbow 7. Superficial temporal temporal pulsation; art can be detected in healthy people, which means physical and / or emotional stress. when ^
    The gray noises are the sounds that are called. Instead of heart sounds (C), accompanied by tones C or occur without any connection with tones C. Classification: I. inside the sulfuric: a-organ-it is 1 valve, 2 non-valve; b-functions are 1-intermediate, 2-pure functions, 3-physical ones; II extra-e: a-perekardia-e, b-pleuropericardi-e, c-cardiopulmonary Mech m of internal noise Noises C - these are mechanical oscillations of the engine caused by
    Milk productivity, organoleptic, physico-chemical and technological properties of milk depend on the period of lactation, breed, age, quality of feeding, conditions, health status, milking, exercise, season, individual characteristics of lactating animals. Lactation periods. Lactation, in terms of changing the composition and properties of milk, can be divided into 3
    Foreign substances that may be contained in milk and have a negative effect on human health include antibiotics, pesticides, disinfectants, radioactive substances, mycotoxins, nitrates, nitrites and other impurities. Many of these substances contribute to the disruption of technological processes in the development of dairy products, which leads to a decrease in their nutritional value.
  15. The influence of the professional activities of astronauts on their psychological properties and qualities
    The influence of the professional activities of astronauts on their psychological properties and
    On palpation of the common carotid, humeral, ulnar, temporal, femoral, popliteal, and rear art stops, the tasks are narrowed down to an approximate assessment of the pulsatory movements by voltage and filling. The carotid artery is palpated on the left and right in a delicate way, removing the sternoclavicular-nipple muscle outwards at the level of the thyroid cartilage, palpating the facts of the common carotid artery on the left and right.
  17. The influence of environmental factors of air, water and soil on the state of the dentition
    Any property or component of the environment that can have a direct or indirect (indirect) effect on living organisms is called an environmental factor. Conventionally, environmental factors are usually divided into biotic and abiotic. Biotic factors are the effects of wildlife components (animals, plants, microbes) on the body, abiotic are the effects on the body
Medical portal "MedguideBook" © 2014-2019