The principle of temperature and humidity meter

< p > when there are a lot of moisture in the air, we say that the air is wet. Scientists often use to describe how much moisture in the air relative humidity. In simple terms is to imagine the air is a towel. If you'd spilled a cup of water, you can use a towel to absorb water. But the fact is that towel can absorb more than a cup of water. Maybe it can absorb five to ten cups of water. Water in some of the amount of water vapour in the air can only have part of the hydrosphere, so the relative humidity is a percentage. When the relative humidity is one hundred percent, and the air is saturated. Like a do wet towel, air can no longer take water. When the relative humidity is one hundred percent and the air is saturated, evaporation and deposition in the equilibrium state. To reach the balance again increase the amount of evaporation, as water sediment. Water vapor was called as the humidity in the air. Because of water vapor molecules so tiny so they cannot be seen, the humidity of the people has developed a creative method to measure the amount of water vapor. Anna degrees - perhaps - - - - - - - - - - - - - - - - - - A people born in Italy in the 15th century - - - - - - - - - - - - - Is the first to come up with this instrument to measure the content of water vapor in the air. 。 He put a dry cotton bang on the side of a day. Then he put a is the same as the cotton of the weight of the object on the other side of the day with. When dry cotton absorbs water vapor from the air, it become more heavy and the day with the side began to sink. Is the humidity in the different between the two weight metrics. Now scientists used an instrument called a psychrometer to measure relative humidity. Psychrometer caused by two thermometer tied together. A thermometer bubble was encased in material soaked with water. Began to measure relative humidity to turn psychrometer brigade until covered in thermometer to maintain a stable temperature, the temperature must be lower than the stem of the thermometer. The thermometer to measure the actual air temperature was dry. In the different between the two temperature was called for wet - Bulbdepression is the result of evaporation of water from the material. Scientists record low temperature and wet - dry thermometer Bulbdepression, then made a chart, to calculate the relative humidity. < / p > < p > chaozhou xiang li electrical appliance factory specializing in the production of small night light light and night light, LED rechargeable small desk lamp socket. < / p > < p > < / p > < p > the article source: li 3 c electric light a night light ea - gl。 com

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