Temperature and humidity sensor
Temperature: The physical quantity that measures the hot and cold of an object is one of the seven basic physical quantities in the International System of Units . In production and scientific research, many physical phenomena and chemical processes are carried out at a certain temperature, and people's lives are closely related to him. 　　
   Humidity: There is a close relationship with life before the humidity is long , but it is more difficult to express it by quantity. The means of humidity are absolute humidity, relative humidity, dew point, moisture to dry gas ratio (weight or volume), and the like. The most commonly used physical quantity for expressing humidity in daily life is the relative humidity of the air. Expressed in %RH . Relative humidity has a close relationship with temperature in the derivation of physical quantities. A certain volume of closed gas, the higher the temperature, the lower the relative humidity, and the lower the temperature, the higher the relative humidity. Temperature and humidity sensors involve complex thermal engineering knowledge. 　　
   Some definitions about humidity: 　　
   Relative Humidity: In the metrology method, humidity is defined as the “ amount of object state †. The moderation referred to in daily life is relative humidity, expressed as RH% . In short, the percentage of the amount of water vapor (water vapor pressure) in a gas (usually in air) and the amount of saturated water vapor (saturated water vapor pressure) in the same condition as air. Welcome to the company's official website http://
   Absolute humidity: refers to the amount of water vapor actually contained in the air per unit volume, usually in grams. Temperature has a direct effect on absolute humidity. Under normal circumstances, the higher the temperature, the more water vapor is emitted, and the greater the absolute humidity; on the contrary, the absolute humidity is small. 　
Saturated humidity: The maximum amount of water vapor that can be contained in the air per unit volume at a certain temperature. If this limit is exceeded, excess water vapor will condense and become water droplets. At this time, the humidity of the air becomes called saturated humidity. The saturated humidity of the air is not fixed and it changes with temperature. The higher the temperature, the more water vapor can be contained in a unit volume of air, and the greater the saturation humidity. 　
   Dew point: refers to air containing a certain amount of water vapor (absolute humidity). When the temperature drops to a certain level, the water vapor will reach saturation (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 " and is referred to as " dew point " . 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, the wind is closely related to the temperature and humidity in the air, and is also one of the important factors affecting the temperature and humidity changes of the air.
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