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四、压缩空气的干燥系统1.空气的湿度与露点一般空气含有一定量的水蒸汽,即空气在给定的条件下有一定的含湿量。空气中含有水蒸汽的程度称为空气的湿度。空气湿度常用绝对湿度和相对湿度两个概念来表示。每1米3空气中所含水蒸汽的重量,即空气的绝对湿度。相对湿度为1米3空气中所含水蒸汽的重量与同温同压下使1米3湿空气完全饱和时所含水蒸汽重量之比,常用（?）表示。空气的含湿量为1公斤干空气中所含水蒸汽的重量（克/公斤）,用X表示。
Fourth, compressed air drying system 1. Air humidity and dew point The general air contains a certain amount of water vapor, that air has a certain moisture content under the given conditions. The degree of water vapor in the air is called the humidity of the air. Air humidity commonly used in absolute humidity and relative humidity to represent the two concepts. The weight of the water vapor contained in the air per 1 m 3, that is, the absolute humidity of the air. Relative humidity of 1 m 3 The weight of water vapor contained in the air with the same temperature and pressure so that 1 m 3 wet air when fully saturated water vapor weight ratio, commonly used (?) Said. The moisture content of air is 1 kg of dry air contained in the weight of water vapor (g / kg), with X said.