41. Antonio Valsalva was one of the first recorded Western observers of the respiratory arterial pressure wave phenomenon. 42. -human ears can distinguish air pressure waves within the frequencies range of : 20 to 20000 Hz; 43. Furthermore, experiments have been carried out under vacuum, in which case there are no air pressure waves . 44. These results show that ballistic impacts produce pressure waves that propagate at close to the speed of sound. 45. A transient pressure wave from a nearby detonation may compress the explosive sufficiently to make its initiation fail. 46. Models of sound waves as pressure waves in my physics class seem to assume the ideal gas law. 47. The dark halo may have been caused by an atmospheric shock or pressure wave produced by the incoming body. 48. They are able to detect the presence of pressure wave _ or motion of another body in the water. 49. Once they feel the pressure wave of our offense, they may not have more stomach for the fight ." 50. Then the pressure wave hit me and it felt like it was going to break every bone in my body.
