. Echoes of bats and men. Sound-waves; Echolocation (Physiology); Orientation. ECHOES AS MESSENGERS mosphere exerts the same pressure as does a 76-centi- meter column of mercury). Furthermore, these re- gions of slightly higher or lower pressure travel through the air, so that the zone of higher pressure which at one moment is passing a particular point will later be found some distance away. These pressure changes are much smaller than most people realize; for ex-. Fig. 3. If you could photograph the molecules of air around a source of sound, you would find some mole- cules grouped closely an
. Echoes of bats and men. Sound-waves; Echolocation (Physiology); Orientation. ECHOES AS MESSENGERS mosphere exerts the same pressure as does a 76-centi- meter column of mercury). Furthermore, these re- gions of slightly higher or lower pressure travel through the air, so that the zone of higher pressure which at one moment is passing a particular point will later be found some distance away. These pressure changes are much smaller than most people realize; for ex-. Fig. 3. If you could photograph the molecules of air around a source of sound, you would find some mole- cules grouped closely and others loosely. There is a high pressure in the close-packed areas and a lower pressure elsewhere. A graph of this variation in pres- sure is a sine curve. 39. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Griffin, Donald R. (Donald Redfield), 1915-. Garden City, N. Y. : Anchor Books
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