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相对湿度是空气的重要参数之一,测量空气中相对湿度的方法有好多种,其中干湿球温度测湿法使用较为广泛,因为它具有价廉易得、构造简单、使用方便等等优点。但在0℃以下空气测量过程中,作湿球介质的水要结冰,虽然包上冰衣后还是可以根据冰表面蒸发情况来测量湿球温度,然而由于包冰衣需一定时间,且温度在零度上下经常变动时,冰衣包不好,使湿球温度计的水银柱经常上下不稳定(因湿球介质水与冰间的相互转变有吸热和放热过程),无法测量空气中的相对湿度。针对这个问题,就想试用冰点较低的盐溶液代替水来作湿球介质,从而避免上述情况,使干湿球
Relative humidity is one of the important parameters of air. There are many ways to measure the relative humidity in the air. The wet and dry bulb temperature measurement and wetting method is widely used because it has the advantages of cheap and easy to get, simple structure, easy to use and so on. However, in the air below 0 ℃ during the measurement process, the wet ball of water to be frozen, although the package after the ice can still be based on the evaporation of ice surface to measure the wet bulb temperature, but because the ice bag takes some time, and the temperature In the zero temperature up and down the regular changes, the ice bag is not good, so wet bulb thermometer often up and down the mercury column instability (due to wet bulb medium water and ice mutual transfer of endothermic and exothermic process), can not measure the relative air humidity. In response to this problem, want to try lower freezing salt solution instead of water for wet ball media, so as to avoid the above situation, the wet and dry ball