When molten, silver occludes the oxygen of the atmosphere, absorbing 20 times its own volume of the gas; the oxygen, however, is not permanently retained, for on cooling it is expelled with great violence; this phenomenon is known as the "spitting" of silver.
Nickel occludes hydrogen readily, is attacked by the halogen elements, and oxidizes easily when heated in air.
Potassium at temperatures from 200 to 400°C. occludes hydrogen gas, the highest degree of saturation corresponding approximately to the formula K 2 H.
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