A little vapour is given off at ordinary temperatures and pressures, and when under a few millimetres pressure only it rapidly vaporizes below Ioo° C. The freezing-point is uncertain, owing perhaps to the existence of two modifications, as suggested by Kast (Zeits.
The water vaporizes and is led from the dome of the evaporator to the head of the condenser.
It vaporizes in a vacuum at 292°, and its boiling-point, under atmospheric pressure, is between 1090° and 1450° (T.
The molten metal is sea-green in colour, and at higher temperatures (in the electric arc) it vaporizes and burns with a green flame.
It is volatile at temperatures above 1oo° C. and rapidly vaporizes at a dull red heat.