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				распространение звука 
				
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				sound propagation 
				The travelling of acoustic waves in the atmosphere with a speed independent of their amplitude. The speed only depends on the acoustic medium and is proportional to the square route of the absolute temperature for any given medium. (Source: RRDA / PARCOR) 
				[http://www.eionet.europa.eu/gemet/alphabetic?langcode=en] | 
		  		
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