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气体分子量的测定是借助于测定一定量气体通过仪器上的小孔扩散所需要的时间来实现的,这就是隙透法。 这种仪器是由一支隙透体积为81—328ml的玻璃管构成,玻璃管的一端被粘上铂箔而封闭,铂箔上面有一个直径为0.137—0.332mm的小孔,这种仪器既可以准确地测定O_2、N_2、CH_4、C_2H_6、CO_2等气体的分子量,又可以测定H_2的分子量,误差在0.30％以内。还可以测定极易挥发的液体的分子量。如果选用适宜的毛细管代替隙透孔,就可以测定气体分子的直径。
The gas molecular weight is determined by measuring the amount of time it takes for a certain amount of gas to diffuse through the holes in the instrument, which is the gap-through method. This instrument is composed of a gap through the volume of 81-328ml glass tube, one end of the glass tube is glued to the platinum foil and closed, platinum foil has a diameter of 0.137-0.332mm above the hole, this instrument both The molecular weight of O_2, N_2, CH_4, C_2H_6, CO_2 and other gases can be accurately determined, and the molecular weight of H_2 can be determined with the error within 0.30%. It is also possible to determine the molecular weight of highly volatile liquids. If you choose the appropriate capillary instead of aperture through hole, you can determine the diameter of gas molecules.