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Updated: June 8, 2025
According to the wave theory, a condensation and rarefaction are necessary to constitute a sound wave. Surely, if a condensation is not produced, there can be no sound wave! We have then no need to consider anything but the condensation or compression of the supposed air molecules, which will shorten the discussion. The property of mobility of the air and fluidity of water are well known.
This acid was proved to be oleic, by its saturating power and its melting point, which were fairly concordant with those of the pure acid. Appearance, etc. The sample was of a deep brown color, of a fluidity intermediate between olive and castor oil, and possessed a strong, rather disagreeable odor. The Specific Gravity at 60° Fahr., 914.0.
In a substance of imperfect fluidity, like molten rock, it is hardly credible, that the separate, infinitely small atoms, whether of feldspar, augite, or of any other mineral, would have power from their slightly different gravities to overcome the friction caused by their movement; but if the atoms of any one of these minerals became, whilst the others remained fluid, united into crystals or granules, it is easy to perceive that from the lessened friction, their sinking or floating power would be greatly increased.
Without water the solid materials of the globe would be unable to come together so closely as to interchange their elements; and unless the temperatures were sufficiently high to establish an igneous fluidity, such as undoubtedly exists in the sun, there would be no circulation of matter to speak of, and the earth would be, as it were, locked up or dead.
Near Tagus or Banks' Cove, I examined one of these great streams of lava, which is remarkable from the evidence of its former high degree of fluidity, especially when its composition is considered. Near the sea-coast this stream is several miles in width.
"'Bhishma said, "Do thou, O son, O sinless one, listen once more, with feelings of great pride, to the words that fell from the lips of the Island-born Rishi on the subject of the enumeration of the entities. The properties of water are coolness, taste, moisture, liquidity, softness, agreeableness, tongue, fluidity, capacity to be congealed, and power to melt many earthly products.
We can observe evidence that the material was in the state of igneous fluidity by the fact that it has baked the country rocks on either side of the fissure, the amount of baking being in proportion to the width of the dike, and thus to the amount of heat which it could give forth.
Causticity and fluidity have long since been excluded from the characteristics of the class, by the inclusion of silica and many other substances in it; and the formation of neutral bodies by combination with alkalis, together with such electro-chemical peculiarities as this is supposed to imply, are now the only differentiæ which form the fixed connotation of the word Acid, as a term of chemical science.
But finding the multiplication table of no avail, I summoned up a grayish image of chaos in a sort of sliding fluidity, and was just falling into a nap on the strength of it, when I heard a solitary and distinct buzz. The hour of my calamity was at hand. One blended hum, the creature darted into the canoe like a small swordfish; and I out of it.
A stream of music, soft and rich and fluid, came out of the flute. He played beautifully. He moved his head and his raised bare arms with slight, intense movements, as the delicate music poured out. It was sixteenth-century Christmas melody, very limpid and delicate. The pure, mindless, exquisite motion and fluidity of the music delighted him with a strange exasperation.
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