Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 49
g then the atmosphere parcelled out into suchcondensations and rarefactions, with their respective tem-peratures, an extraneous sound passing through such anatmosphere would be as much retarded in the latter asaccelerated in the former, and no variation of the averagevelocity could result from such… … be compressed it becomes smaller in volume; if thepressure be diminished the volume expands. The forcewhicli resists compression, and which produces expansion,is tlie elastic force of the air. Thus an external pressuresqueezes the air-particles together; their own elastic forceholds them asunder,…
Sound
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