Читать книгу Heads of Lectures on a Course of Experimental Philosophy: Particularly Including Chemistry - Joseph Priestley - Страница 14
Of Inflammable Air.
ОглавлениеInflammable air is procured from all combustible substances by means of heat and water, and from several of the metals, especially iron, zink, and tin, by the vitriolic and marine acids.
From oils and spirit of wine it is procured by the electric spark. By the same means also alkaline air is converted into it.
That which is procured from metals, especially by steam, is the purest and the lightest, about ten times lighter than common air; in consequence of which, if a sufficient quantity be confined in a light covering, it is possible to make it carry up heavy weights.
When it is procured from animal or vegetable substances, it is of a heavier kind, and burns with a lambent flame, of various colours, according to the circumstances.
Calces of metals heated in inflammable air are revived, and the air absorbed; and since all the metals are revived in the same inflammable air, the principle of metallization, or phlogiston, appears to be the same in them all.
Pure inflammable air seems to consist of phlogiston and water, and the lambent kinds to be the same thing, with the addition of some oily vapour diffused through it.
