Lectures on Chemistry: Including Its Applications in the Arts, and the Analysis of Organic and Inorganic Compounds

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Simpkin, Marshall, 1843 - 505 oldal
 

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20. oldal - It purifies it by distillation, when it raises it in vapours, and lets it fall in rain; and farther still by filtration, when, keeping it fluid, it suffers that rain to percolate the earth. We knew before that putrid animal substances were converted into sweet vegetables, when mixed with the earth, and applied as manure; and now, it seems, that the same...
206. oldal - ... that whenever two volumes of air of different temperatures, are mixed together, each being previously saturated with vapour, a precipitation of a portion of vapour must ensue, in consequence of the mean temperature not being' able to support the mean quantity of vapour. This...
345. oldal - ... and at last I arrived at the conclusion that a metallic tissue, however thin and fine, of which the apertures filled more space than the cooling surface, so as to be permeable to air and light, offered a perfect barrier to explosion, from the force being divided between, and the heat communicated to an immense number of surfaces.
14. oldal - I do not here consider. What I call attraction may be performed by impulse, or by some other means unknown to me. I use that Word here to signify only in general any Force by which Bodies tend towards one another, whatsoever be the Cause.
345. oldal - In exploding a mixture of 1 part of gas from the distillation of coal, and 8 parts of air in a tube of a quarter of an inch in diameter, and a foot long, more than a second was required before the flame reached from one end of the tube to the other ; and...
181. oldal - Are we not, then, authorized to conclude that water is composed of dephlogisticated air and phlogiston, deprived of part of their latent or elementary heat; that dephlogisticated or pure air is composed of water deprived of its phlogiston, and united to elementary...
182. oldal - ... each. The electric spark having passed through them, the flask became hot, and was cooled by exposing it to the common air of the room : it was then hung up again to the balance, and a loss of weight was always found, but not constantly the same ; upon an average it was two grains." He goes on to say, " I have fired air in glass vessels since I saw you (Dr. Priestley) venture to do it, and I have observed, as you did, that, though the glass was clean and dry before, yet, after firing the air,...
18. oldal - ... of sulphur; but as I had got nothing like this remarkable appearance from any kind of air besides this particular modification of nitrous air, and I knew no nitrous acid was used in the preparation of mercurius calcinatus, I was utterly at a loss how to account for it.
18. oldal - I proceeded with great alacrity to examine by the help of it what kind of air a great variety of substances, natural and factitious, would yield...
204. oldal - English) of the surface of the earth ; the diameter of the earth and its superficies are likewise known, so that the weight of the atmosphere can be calculated with the greatest exactness. The thousandth part of this is carbonic acid, which contains upwards of 27 per cent, carbon. By this calculation it can be shown, that the atmosphere contains 3306 billion Ibs. of carbon ; a quantity which amounts to more than the weight of all the plants, and of all the strata of mineral and brown coal, which...

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