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温标理论上的热力学温标事实上不能在实际测温中应用,所有工业测温都是根据国际实用温标(IPTS)进行的。该温标根据指定的纯净物质物态的变化来规定确切的温度,并按此温标来描述这些固定点之间的测温方法。尽管这些点被称为“固定点”,但它们的温度根据热力学温标上有关它们更正确的测定值在不断地进行修订,然而,却很少进行。因1948年的温标已不能适用,最近的一次修订是1968年进行的,下次修订估计在1988年前后进行。在涉及大量处理低温液体的上述温度范围,温标上幸亏没有多大变化,因此,实际应用上也没有引起什么麻烦。在此温度范围,1948温标与1968温标之间最多只相差0.034℃。
Thermodynamic standard temperature scale in fact can not be used in the actual temperature measurement, all industrial temperature measurement are based on International Practical Temperature Scale (IPTS) carried out. The temperature scale specifies the exact temperature according to the change of the specified pure material state, and then the temperature scale is used to describe the temperature measurement method between these fixed points. Although these points are referred to as “fixed points,” their temperatures are constantly being revised based on the thermodynamic temperature scale with respect to their more correct measurements, however, they are infrequent. Since the 1948 temperature scale has not been applied, the latest revision was carried out in 1968, and the next revision is estimated to be around 1988. In the above-mentioned temperature range that involves a lot of handling of cryogenic liquids, the temperature scale does not change much, so there are no problems in practical application. In this temperature range, the difference between 1948 temperature scale and 1968 temperature scale is only 0.034 ℃ at most.