21.   TASHE operates entirely on pressure waves, using high-intensity sound to do the work of steel.

22.   The DC-X would have to withstand a veritable whirlwind of air currents and pressure waves threatening to topple the rocket or throw it out of control.

23.   The main engines then detonated the gases, sending a pressure wave up one side of the vehicle.

24.   Then the pressure wave hit me and it felt like it was going to break every bone in my body.