✍ Scribed by A. van Itterbeek; L. Lauwers
No coin nor oath required. For personal study only.
We measured the velocity of sound.in gaseous ammonia by using ultrasonics (514,50 kc]s). The velocity is measured as a function of pressure. From these measurements we could sheck the experimental data established by G. H o 1 s t (ThAse de l'Ecole Polytechnique Fdddrale de Ziirich, 1914) for the second virialcoefficient of ammonia. We find a satisfactory agreement with these data.
From our measurements we computed (cp/%)p= o. We find that these values increase with decreasing temperature and become greater than 1,333. This has also b~en observed by Giaco mini (Phil. Mag. 50, 146, 1925) from direct measurements of the specific heats.
Our values are greater than those of G i a c o m i n i which probably is caused by a dispersion effect of the ultrasonic waves.
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