Tin fuses at about 230° C.; at a red heat it begins to volatilize slowly; at 1600° to 1800° C. it boils.
All the rest, when heated by themselves, volatilize, some at lower, others at higher temperatures.
The vessel is then lowered into a jacket containing vapour at a known temperature which is sufficient to volatilize the substance.
It forms small cubes which melt at a red heat and volatilize readily.
Of the simple compounds, only the fluoride is amenable to electrolysis in the fused state, since the chloride begins to volatilize below its melting-point, and the latter is only 5° below its boiling-point.