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The vaporisation heat of liquid helium from 0 to 5.2° K and the value of h, calculated from the thermodynamical behaviour of helium

✍ Scribed by J. Kistemaker

Publisher
Elsevier Science
Year
1946
Weight
293 KB
Volume
12
Category
Article
ISSN
0031-8914

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✦ Synopsis

The vaporisation heat r T was calculated by equalizing the thermic potentials in vapour and liquid. Below the ),-point we calculated rT= 0, using our recent vapour pressure determinations. We found 14.24 + 0.015 cal/mol, ir~ good agreement with Bleaney and Simon's value 14.26. But using the scale 1937 we found an important inconstancy in the results obtained for rT= 0. This shows that an error in the scale 1937 below as well as above the ),-point up to 3°K is probable. A formula for the vapour pressure as a function of T, in the helium II region, is given. The value of h, calculated from the chemical constant, is within 1% in agreement with O h 1 i n's experimental determination.

The vaporisation heat from 0 to 3.5°K, which has been calculated from the difference in entropy between vapour and liquid, is within 1% in accordance with Dan a and Ka merIingh On nes' experimental values; this statement constitutes a reliable confirmation of all thermodynamical data available at this moment.

Above 3.5°K an error of 6% in Dana and Kamerlingh Onn e s' ,Jalues seems probable.

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