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纯汞密度是在温度、压力、真空、密度等专业计量中都要应用的重要物理量。有关科技工作者希望有一个纯汞密度值表,特别是0～50℃温度范围内的密度值表。现有的的汞密度值表很多,但各表所列数值在第六位甚至第五位上就互有差异,所用单位也不统一,且均采用旧温标。由于汞密度是温度函数,温标的变更直接影响其密度值。现已推行的1968年国际实用温标与已被取代的1948年国际实用温标)(以下缩写为 IPTS—68和 IPTS—48)的差值即 t_(68)-t_(48),在0～50℃温度范围内虽不大(最大差值为0.0105℃),但对于要求准确度高的精密测量来说这一影响是不容忽视的。以20℃汞密度为例:两种温标相差0.0074℃,则密度相差就达0.0182公斤/米~3。
Pure mercury density in the temperature, pressure, vacuum, density and other professional measurement should be applied to the important physical quantities. Scientists and technicians want a pure mercury density table, especially in the temperature range of 0 ~ 50 ℃ density table. There are many tables of available mercury densities, but the values listed in the tables differ from each other in the sixth or even fifth place. The units used are also not uniform, and the old temperature scale is used. Since mercury density is a function of temperature, changes in temperature scale directly affect the density value. The difference between the 1968 International Practical Temperature Scale and the 1948 International Practical Temperature Scale (hereinafter abbreviated as IPTS-68 and IPTS-48), which is now in force, is t_ (68) -t_ (48) Although the temperature range is not large (maximum difference of 0.0105 ℃), but for the accuracy of precision measurement requirements that can not be ignored. Take 20 ℃ mercury density as an example: the difference between the two temperature scales is 0.0074 ℃, the difference in density reaches 0.0182 kg / m ~ 3.