It is non-volatile in steam, and is odourless.
The reasoning given above is independent of the temperature, so that the variation with temperature of the osmotic pressure of a dilute solution must be the same as that of a gas, while Boyle's law must equally apply to both systems. Experimental evidence confirms these results, and extends them to the cases of non-volatile solutes - as is, indeed, to be expected, since volatility is merely a matter of degree.
The neutral esters are as a rule insoluble in water and distil unchanged; on the other hand, the acid esters are generally soluble in water, are non-volatile, and form salts with bases.
The dibromide, WBr 2, is a non-volatile bluishblack powder obtained by reducing the pentabromide with hydrogen.
The apparent " body " of the wine, however, is not merely dependent upon the absolute quantity of solid - non-volatile - matters it contains, but is influenced also by the relative proportions in which the various constituents exist.
