transducers<\/a>Is humidity, as we all know, humidity is the concentration of moisture in the air, the size of the humidity affects our physical sensations, affecting the growth of plants, affecting the life cycle of the equipment; we are not dealing with humidity all the time, from smart phones to air quality monitoring systems; from the use of air conditioning to adjust the ambient humidity of the room so that we can be comfortable to the hospital for the patients who have difficulty breathing to maintain the right humidity; from high-tech chip production and From high-tech chip production and packaging and testing enterprises to maintain the humidity of the production environment to agricultural greenhouses in order to have a good environment for the survival of crops and set the humidity, and so on various industries, we can not do without humidity; a scientific study shows that: maintain indoor relative humidity > 40% will significantly reduce the infectiousness of the atomized virus.<\/p>Because humidity affects chemical, biological, and physical processes, the same amount of water vapor results in higher relative humidity in cold air than in warm air. The amount of water vapor contained in a package of air can vary greatly. For example, a nearly saturated piece of air may contain 28 g of water per cubic meter at 30 \u00b0C (86 \u00b0F), but only 8 g of water per cubic meter at 8 \u00b0C (46 \u00b0F). This amount is therefore measured by an air humidity sensor and converted into a readable data form for external use. There are three ways to define humidity:<\/p>
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Dew point Dp(Dew point)<\/h3>
The dew point, expressed in \u00b0C, is the temperature and pressure at which a gas begins to condense into a liquid. When air is cooled to the dew point by contact with a surface colder than air, water condenses on the surface. Devices called hygrometers are used to measure dew point over a wide range of temperatures. These devices consist of a polished metal mirror that cools as air passes through it.<\/p>
Absolute humidity(AH)<\/h3>
Absolute humidity is the total mass of water vapor present in a given volume or mass of air. It does not take temperature into account. When air is saturated at 30 \u00b0C (86 \u00b0F), the absolute humidity in the atmosphere ranges from near zero to about 30 grams per cubic meter. Absolute humidity is the mass of water vapor divided by the volume of the air and water vapor mixture (refer to the following formula)<\/p>
\u03a1w =e\/(Rw*T)=m\/V\n