What are the differences (I'm really trying to understand the differences in the context of an explosion). When you hear it, are you hearing all 4 waves? Which waves cause the damage and why - why not the others? Also, when NASA launches the space shuttle, they release water to absorb the 'acoustical energy', these are soundwaves? EDIT: I read somewhere that a sound wave turns into a pressure wave if exceeds some dB - what happens to it here?