A Short History of the Progress of Scientific Chemistry in Our Own Times
The book A Short History of the Progress of Scientific Chemistry in Our Own Times was written by author Tilden, William A. (William Augustus), Sir, 1842-1926 Here you can read free online of A Short History of the Progress of Scientific Chemistry in Our Own Times book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Short History of the Progress of Scientific Chemistry in Our Own Times a good or bad book?
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On this series of observations Andrews was able to base an interesting distinction between a "gas"- 246 A SHORT HISTORY OF THE and a " vapour," terms whicli up to this time had been used in an uncertain and arbitrary way. "Ether," he says, "in the state of gas is called a vapour, while sulphurous acid in the same state is called a gas ; yet they are both vapours, the one derived from a liquid boiling at 35°, the other from a liquid boiling, at — 10°. . . . Many of the, properties of vapours dep...end on the gas and liquid being present in contact with one another, and this we have seen can only occur at temperatures below the critical point. We may accordingly define a vapour to be a gas at any temperature under its critical point. ... If this definition be accepted, carbonic acid will be a vapour below 31°, a gas above that temperature ; ether a vapour below 200°, a gas above that temperature." The most important deduction from the results of these experiments, then, supplies a clear explanation of the difficulty encountered in attempting the liquefaction of the six exceptional gases.
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