Coaxial Cable,Coax Cable,BNC Cable,CCTV Pre-made Cable,DC power splitter Chinasky Electronics Co., Ltd. , https://www.chinaskyswitches.comWhat is air humidity? It represents the physical quantity of atmospheric dryness. The less water vapor in a certain volume of air at a certain temperature, the more dry the air; the more water vapor, the more humid the air. The degree of dryness and humidity of the air is called "humidity". In the cold winter, we often stay in a comfortable air-conditioned room, and this