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Updated: June 21, 2025
The rarefaction of the air was fast expanding the hydrogen in the balloon, and I saw its lower part, purposely left empty, swell out, so that it was absolutely necessary to open the valve; but my companion did not seem to intend that I should manage the balloon as I wished. I then resolved to pull the valve cord secretly, as he was excitedly talking; for I feared to guess with whom I had to deal.
The spectacle of to-morrow is one of agony. Wise men make laughable efforts to determine what may be, in the ages to come, the cause of the inhabited world's end. Will it be a comet, the rarefaction of water, or the extinction of the sun, that will destroy mankind? They have forgotten the likeliest and nearest cause Suicide.
We now felt all the inconvenience of an extremely rarefied atmosphere coming upon us, and we commenced to arrange some experiments in atmospheric electricity. Our first attempts did not succeed. We threw over part of our ballast, and mounted up till the cold and the rarefaction of the air became very troublesome. During our experiments we experienced an illness throughout our whole system.
It must exist, I argued; although it may exist in a state of infinite rarefaction. "On the other hand, I was aware that arguments have not been wanting to prove the existence of a real and definite limit to the atmosphere, beyond which there is absolutely no air whatsoever.
It had been erroneously supposed that the ascent of the Montgolfier balloon had been due, not to the rarefaction of the air within it which was its true cause but to the evolution of some light gas disengaged by the nature of the fuel used.
A crowding of atoms is called a condensation, and a parting is called a rarefaction, and when we speak of the length of a wave of sound, we mean the distance between two condensations, or between two rarefactions. Although each atom of air moves a very little way forwards and then back, yet, as a long row of atoms may be crowded together before they begin to part, a wave is often very long.
Among sonorous bodies which move in the same way, only very much faster, we may mention tuning forks." Tyndall says again: "When a common pendulum oscillates, it tends to form a condensation in front and a rarefaction behind.
The remedy in this case is to contract the opening of the chimney so as to oblige all the entering air to pass through or very near the fire, by which means it will be considerably heated, and by its great rarefaction, cause a powerful draft, and compensate for the shortness of its column.
Of course, it was not possible to judge very accurately the character of the buildings, or to see much detail, for the city was some twenty miles distant from the spot to which Busa had conducted the party, while the rarefaction of the atmosphere rendered even the field-glasses of little use.
Here dwelt the keeper and his kind-hearted little wife, and no one besides save Love and Beauty. There was thus a feeling of rarefaction in the atmosphere, as though at this height it was only the Alpine flora of humanity that could find root and breathing.
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