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Knowledge of temperature and humidity sensor

2020-05-25 Source: admin
Temperature and humidity sensor Knowledge that cannot be unknown. One of the basic physical measures of a body is the international system of temperature. In production and scientific research, many physical phenomena and chemical processes are carried out at a certain temperature, and people's life is closely related to him.

Humidity: humidity has a close relationship with life for a long time, but it is difficult to express it by quantity. The most commonly used physical quantity of humidity in daily life is the relative humidity of air. Expressed as% RH. In the derivation of physical quantities, the relative humidity has a close relationship with temperature. The higher the temperature is, the lower the relative humidity is. The lower the temperature is, the higher the relative humidity is. It involves complicated knowledge of thermal engineering.

Some definitions of humidity: relative humidity: in the metrology law, humidity is defined as "the quantity of object image state". The humidity in daily life is relative humidity, expressed by RH%. In short, that is, the percentage of saturated water vapor (saturated water vapor pressure) in a gas (usually in air) when it is the same as that in air.

Absolute humidity: refers to the unit volume of air in the actual moisture content, generally in grams. Temperature has a direct impact on absolute humidity. Generally speaking, the higher the temperature is, the more water vapor is emitted, the greater the absolute humidity is; on the contrary, the absolute humidity is small.

Saturated humidity: at a certain temperature, the maximum amount of water vapor in the air per unit volume. If this limit is exceeded, the excess water vapor will condense and become water droplets. At this time, the air humidity becomes saturated humidity. The saturation humidity of air is not fixed, it changes with the change of temperature. The higher the temperature, the more water vapor can be contained per unit volume of air, and the greater the saturation humidity.

Dew point: refers to the air containing a certain amount of water vapor (absolute humidity). When the temperature drops to a certain degree, the water vapor contained will reach the saturation state (saturated humidity) and begin to liquefy into water. This phenomenon is called condensation. The temperature at which water vapor begins to liquefy into water is called "dew point temperature" for short. If the temperature continues to drop below the dew point, the supersaturated water vapor in the air will condense into water droplets on the surface of the object. In addition, wind is closely related to the temperature and humidity in the air, which is also one of the important factors affecting the change of air temperature and humidity.
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