often on television or radio receivers from the speakers, we hear about the pressure and humidity.But few people know, which affects their performance and how various values affect the human body.
Humidity - a characteristic of the saturation of the atmosphere with water vapor.In different parts of the globe its performance may differ substantially.In nature, there is no air without water vapor.On Earth, there is no place where met the zero relative humidity.Thus, in the Sahara Desert - 25 percent, Brazilian jungle - 90.
relative humidity - the ratio of moisture in the atmosphere as compared with the maximum possible at a given temperature or degree of saturation with water.That is, this figure shows how much still needs to be vapor, to begin the process of condensation.The relative humidity of the air - is one of the major characteristics of the environment.
absolute figure measured in 1 g / m3 or in millimeters of mercury.At the equator, it is 20-30 g / m3, while in the Arctic and Antarctic - 0.1-1.
Humidity human
Humidity, which is the norm for premises from 40 to 60 percent, clearly felt the man.It reaches the largest value in the summer when it rains: then its index is at around 80-90%.
the winter in apartments Russians observed exactly the opposite situation.Because heating reduces the relative humidity as much as 15 percent.This is because increasing the temperature of the heaters, which in turn, causes evaporation of moisture from the active surface of the body and furniture.
Humidity - often underrated factor.This indicator tends to the minimum or maximum values, deteriorating health of human: increased fatigue, reduced memory and concentration properties.In order to stay in good shape physically and mentally, it is necessary to ensure optimum humidity space in which people live and work.For this there are special air-conditioning system.
Evaporation of moisture from the skin is also affected by moisture, which in turn determines the temperature of the human body and the state of his body.Favorable indicators for life is 40-60%.Such humidity promotes well-being.This figure is artificially maintained in the compartments of the spacecraft.
Means and methods for determining
to determine the saturation of air with water vapor using special instruments: psychrometers and hygrometers.Psychrometer August is a bar with two thermometers: wet and dry.
first wrapped with a cloth soaked in water, the evaporation of which cools the casing.Relying on the testimony of these thermometers, the tables determine the relative humidity of the air.There are many different hydrometers, their work may be based on weight, tape, electric or hairline, as well as a number of other principles of action.In recent years gained popularity integral measurement sensors.In order to verify the accuracy of the measuring devices used hydrostats.
