We have heard many times: "absolute" and "relative humidity."What kind of performance?With absolute value is clear: the number of particles of water vapor contained in one cubic meter of air.But what practical benefit will bring us the news that in our environment the invisible presence of five units of moisture per cubic meter?After all, we can not even say whether the air is dry, normal or too crude, since at different temperatures, its composition changes.After atmospheric environment - like a sponge, the warmer it is, the more water vapor it dissolves.When sharply colder (for example, on clear nights), cold compresses invisible hand "sponge" and the dew drops.A heat contact with a carafe of ice water, leaves on the glass "sweat."
So, if "5 units per cubic meter" is an absolute indicator, but with respect to ambient temperature it can be considered dry (in the heat), normal or high (in the cold).It is more convenient in the household needs to use another indicator, namely "relative humidity."At a certain degree of temperature, the atmosphere can hold a certain amount of steam.If it is the most sated pairs, we say that the "wet" is 100%.This, for example, Russian bath, where hot, but it is also a thick fog, and finding within the clouds at high altitude, where it is cold.That is, the absolute amount of water in the form of steam bath, fog and cloud is different, but the water saturation is the same - 100%.
And this relative humidity plays an important role in changing our health.Remember how hard it is to breathe, and how sleepy before the storm.This environment is filled with invisible water: it increases the fullness of the normal 50% to 80. But excessive dryness also leads to problems: tickle in the throat, the body loses a lot of moisture.This is particularly evident in our homes in the winter.
Look, the room gets cold (for example, on the street - 10 C).Even if the relative humidity of outside air is high, the absolute amount of it is low (since the cold outside).Heated on the stove or radiators, the percentage of water in our environment is changing from high to low.If the room is +25 C, frost masses begin to literally suck the moisture from the objects and people in the room.Wooden furniture rassyhaetsya, yellow flowers, and people feel the sore in the mouth, cracked lips, desiccate the skin and hair.It is not easy in such a situation, those who wear contact lenses: the eyes become red, itchy.Allergy too hard times - excessive dryness aggravates reaction to the dust.Therefore advised to place the batteries near a saucer with water, although it is not a panacea.
to always be aware of the percentage of water vapor contained in the air, you can buy special moisture meters, called a hygrometer.After all, in humid conditions, as is known, multiplying germs.Therefore bursts influenza epidemics and acute respiratory infections account for just for the winter thaw, when the south wind raises the temperature increases and "phlegm".In hot weather, when the "float" and stuffy, increases the number of heart attacks is not easy to have to asthmatics.At high humidity cold and heat transferred heavier than when dry.Optimally for all of our body - 50-60% water saturation of the surrounding atmosphere.
With two simple thermometers can build your own hygrometer.How to measure the humidity in the home, without chemicals?We put both of the thermometer in the shade, but the lower part of one of them, wrap a piece of felt soaked in water.Evaporation of water cools the thermometer.If the relative humidity is high, felt dries slowly, and both thermometer - wet and dry - show the same temperature.If low, cloth dries quickly, and covered with sweat meter gives smaller figures.
