Table 129. 

 VELOCITY OF SOUND IN LIQUIDS AND GASES. 



H7 



For gases, the velocity of sound=v'7i:'/P, where P is the pressure, p the density, and 7 the ratio of 

 specific heat at constant pressure to that at constant volume (see Table 253). For moderate tem- 

 perature changes V,, = Vod + ot) where 0=0.00367. The velocity of sound in tubes increases with 

 the diameter up to the free-air value as a limit. The values from ammonia to methane inclusive are 

 for closed tubes. 



Smithsonian Tablcs, 



