衡量法测定玻璃量器在标准温度20℃时的实际容量V,是由下列质量一体积换算公式求得的: P=V·E_t[1+β(t-20)]··σ/(σ-e)·(1-e/E_t) (1)式中: P-在实际测量温度t℃时称出的被检容量的纯水质量值; t-测定时的实际温度; E_t-t℃时纯水密度; β-玻璃的体膨胀系数; The actual volume V of the glassware measured at the standard temperature of 20 ° C by the measuring method is obtained from the following mass-volume conversion formula: P = V · E_t [1 + β (t-20)] · σ / (σ - e) (1-e / E_t) (1) Where: P - in the actual measured temperature t ℃ when weighed out of the pure water quality value; t - the actual temperature measured; E_t-t ℃ Pure water density; β-glass body expansion coefficient;