(See Thermometry.) Fusibility and Volatility.-The fusibility in different metals is very different, as shown by the following table, which, besides including all the fusing points (in degrees C.) of metals which have been determined numerically, indicates those of a selection of other metals by the positions assigned to them in the table.
For practical purposes the volatility of metals may be stated as follows: i.
The next higher members of the series are liquids of low boiling point also readily soluble in water, the solubility and volatility, however, decreasing with the increasing carbon content of the molecule, until the highest members of the series are odourless solids of high boiling point and are insoluble in water.
These con-, ditions pertain in cases where distillation with steam is successfully practised, the relatively high volatility of water being counterbalanced by the relatively high molecular weight of the other component; for example, in the case of nitrobenzene and water the ratio is I to 5.
The condensing plant varies with the volatility of the distillate.
The supply of water to the condenser is regulated according to the volatility of the condensate.
Its volatility has also been studied by L.
The volatility is barely appreciable at 1075°; at 1250° it is four times as much as at 1 roo°.
Copper and zinc increase the volatility far more than lead, while the greatest volatility is induced, according to T.
The high volatility of gold in the presence of certain metals must also be considered.
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.
His splenetic temper and her volatility culminated in an open rupture in May 1814.
The carbon bisulphide is really spreading all the while, but on account of its volatility is unable to reach any considerable distance.
Frederick Slare noticed that the luminosity increased when the air was rarefied, an observation confirmed by Hawksbee and Homberg, and which was possibly the basis of Berzelius's theory that the luminosity depended on the volatility of the element and not on the presence of oxygen.
You can be a subsistence farmer and perhaps produce some excess, but given the prior observation about the fundamental volatility of farming, you will always be at risk of not producing enough.