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Updated: May 21, 2025
Nothing renders men modest but a just knowledge how to compare themselves with others; and where that is wanting impudence supplies the place of it, for there is no vacuum in the minds of men, and commonly, like other things in Nature, they swell more with rarefaction than condensation.
It is also calculated that at an altitude not exceeding the hundredth part of the earth's diameter that is, not exceeding eighty miles the rarefaction would be so excessive that animal life could in no manner be sustained, and, moreover, that the most delicate means we possess of ascertaining the presence of the atmosphere would be inadequate to assure us of its existence.
Normal shock-waves push away and then spring back! An ice-crack, a rock-slide, an explosion of any sort, all of them make the same kind of waves! All have compression phases, then rarefaction phases, then compression phases, and so on. What " his voice was plaintive "what in hell is this?"
A rent at the top of the balloon caused it to descend within eight minutes, and the duck and sheep were found none the worse for being the first living things to leave the earth in a balloon, but the cock, evidently suffering, was thought to have been affected by the rarefaction of the atmosphere at the tremendous height reached for at that time the general opinion was that the atmosphere did not extend more than four or five miles above the earth's surface.
In reply to the objection drawn from the condensation and rarefaction of bodies, he urges that the apparent increase or decrease in extension is, in fact, a mere change of figure; that the rarefaction of a body depends on the increase in size of the intervals between its parts, and the entrance into them of foreign bodies, just as a sponge swells up when its pores become filled with water and, therefore, enlarged.
The X-ray appearances of arthritis deformans necessarily vary with the type of the disease and the joint affected; in the joints of the fingers there is a narrowing of the spaces between the articular ends of the bones as a result of absorption of the articular cartilage, and rarefaction of the cancellous tissue in the vicinity of the joints; in the larger joints there is "lipping" of the articular margins, osteophytes, and other evidence of abnormal ossification in and around the joint.
The more effectually to remove this prejudice, let it be farther considered, that, as on one hand, opposite causes do sometimes produce the same effect; for instance, heat by rarefaction, and cold by condensation, do both increase the air's elasticity; so, on the other hand, the same cause shall sometimes produce opposite effects.
Accordingly, the air over Mexico, between the latitudes of 10° and 30°, is more heated than that which lies over the sea between the line and latitude 20°; and as the coolest, or least heated, that is, the most dense fluid, always rushes towards the place lately occupied by the hottest and most buoyant, the air from the equator will be drawn towards the coast of Mexico, the great local source of heat and rarefaction.
As the rarefaction approaches about 0.5 millimeter the surface of the negative pole, A, becomes faintly phosphorescent. On continuing the exhaustion this luminosity rapidly diminishes, not only in intensity but in extent, contracting more and more from the edge of the disk, until ultimately it is visible only as a bright spot in the center.
Chrysippus, following Heraclitus, taught that the elements passed into one another by a process of condensation and rarefaction. Fire first became solidified into air, then air into water and lastly water into earth. The process of dissolution took place in the reverse order, earth being rarefied into water, water into air, and air into fire.
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