相对湿度是利用干、湿球温度计和气压计按温湿图计算。温度和总压力(气压计计示高度)均是在(除一次是在深井中、另一次是在高山上外)相同的条件下确定的,然而计算结果确有显著的差别。常用的湿度计表格和温湿(h,x)图一般仅适用于755乇或760乇,有时也适用于735乇的气压计计示高度。不久前作者发表了用于变化着的气压 The relative humidity is calculated using a wet and dry bulb thermometer and a barometer based on a temperature and humidity diagram. Both the temperature and the total pressure (barometer height) were determined under the same conditions (except for one time in deep wells and another time in high mountains). However, there are significant differences in the calculation results. The commonly used hygrometer tables and temperature and humidity (h, x) diagrams are generally only applicable to 755 乇 or 760 乇, and sometimes also apply to 735 乇 barometers. Not long ago the author published the pressure for change