Liquids are amenable to the same treatment, but especial care must be taken so that they volatilize slowly.
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.
The corresponding double chloride is a far better material; first, because it melts at about 180° C., and does not volatilize below a red heat, and second, because the voltage of aluminium chloride is 2.3 and that of sodium chloride 4.3, so that there is a much wider margin of safety to cover irregularities in the electric pressure.
The majority of the metallic chlorides are solids (stannic chloride, titanic chloride and antimony pentachloride are liquids) which readily volatilize on heating.
As a class, the metallic bromides are solids at ordinary temperatures, which fuse readily and volatilize on heating.
Brimstone is easily burned without any extraneous help; indeed the only precaution required is to take care lest the heat produced by the burning sulphur should not volatilize part of it in the unburned state.
To understand the phenomena of the sun, we should reproduce them upon the earth; but this is clearly impossible since they take place at temperatures which volatilize all known substances.