Page:The Liquefaction of Gases.djvu/61

Rh Arseniuretted Hydrogen.—This body, liquefied by and, did not solidify at the lowest temperature to which I could submit it, i.e. not at 166° below 0°. In the following table of the elasticity of its vapour the marked results are experimental, and the others interpolated:—

The following bodies would not freeze at the very low temperature of the carbonic acid bath in vacuo (-166° .):—Chlorine, ether, alcohol, sulphuret of carbon, caoutchoucine, camphine or rectified oil of turpentine. The alcohol, caoutchoucine, and camphine lost fluidity and thickened somewhat at -106°, and still more at the lower temperature of -166°. The alcohol then poured from side to side like an oil.

Dry yellow fluid nitrous acid when cooled below 0° loses the greater part of its colour, and then fuses into a white, crystalline, brittle and but slightly translucent substance, which fuses a little above 0°. The green and probably hydrated acid required a much lower temperature for its solidification, and then became a pale bluish solid. There were then evidently two bodies, the dry acid which froze out first, and then the hydrate, which requires at least -30° below 0° before it will solidify.

The following gases showed no signs of liquefaction