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通常各纸厂用波美计来测定黑液的浓度，方法简便快速．但波美计存在着两种误差，一种是零点误差，一般用水来校零；一种是刻度误差，它是由于波美计细管管径和管壁厚度不标准所造成的。因此必须进行全面校正，下面介绍一种校正方法供大家参考．1按正原理用比重瓶测定出20C标准
Usually the mill with Baume meter to determine the concentration of black liquor, the method is simple and quick. However, there are two kinds of error Bomei, one is zero error, the water is generally used to zero; one is the scale error, which is due to Bomei thin tube diameter and wall thickness caused by non-standard. Therefore, we must conduct a comprehensive correction, the following describes a correction method for your reference. 1 according to the principle of using a pycnometer measured 20C standard