Glycerol viscosity tables
Glycerol viscosity tables
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DOI：
10.1021/ie50273a022
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发表时间：
1932-01-01
影响因子：
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通讯作者：
Sheely, ML
中科院分区：
文献类型：
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作者：
Sheely, ML
尽管文献中有一些说法认为甘油及其水溶液不完全适合用作校准工业粘度计的粘度标准，但这些溶液已普遍用于此目的。对它们提出的主要反对意见在于，甘油浓度高于约85%的溶液是吸湿的，而低于该浓度的溶液在暴露于平均湿度条件下时会失水。经验表明，如果认识到这些事实，并采取预防措施防止这些账户集中度的变化，这些属性不会造成严重困难。有利于将其用于校准目的的主要因素是，纯甘油易于获得，粘度范围宽，甘油含量易于标准化;目前市场上可获得纯度极高的cp甘油，浓度为95%至99%。因此，在更高浓缩级及其水溶液中可获得的粘度范围为12.00 - 0.01泊。通过精确的比重测定，甘油的百分浓度可在± 0.02%以内确定。有了这一信息，一个显示不同浓度的绝对粘度的表格将完成为此目的所需的信息。
NOTWITHSTANDING some statements in the literature to the effect that glycerol and its aqueous solutions are not entirely suitable liquids for use as viscosity standards in calibrating technical viscometers, these solutions have come into common use for this purpose. The principal objection offered against them lies in the fact that solutions above approximately 85 percent glycerol are hygroscopic, whereas those below this concentration give up w'ater when exposed to average humidity conditions. Experience has shown that these properties do not offer serious difficulties if the facts are recognized and precautions taken to obviate changes in concentration on these accounts. The principal points in favor of their use for calibrating purpose are the ready availability in pure form, wide range of viscosities, and ease of standardization as to glycerol content; cp glycerol of exceptionally high purity is available on the present market in concentrations from 95 to 99 per cent. The difference represents largely water, there being usually less than 0.01 per cent foreign impurities present in the c. p. grade.Consequently, the range of viscosities obtainable upon the more highly concentrated grade and its aqueous solutions is from 12.00 to 0.01 poises. By means of an accurate specific gravity determination the percentage glycerol concentration can be determined within±0.02 per cent. With this infor-mation at hand, a table showing the absolute viscosities of varying concentrations would complete the information necessary for thepurpose.