I need some help understanding shock waves, particularly the units of measure related to their pressure. Shock waves are frequently quantified as multiples of G, the gravitational constant. I need to understand how the G measurements related to the instantaneous pressure within the wave as expressed in atmospheres ("ATM"). Is it as simple as a one--to-one relationship? I.e. is the internal pressure in ATM simply equal to the G force? So, for example, if we have a 1,000G shock wave traveling in water at STP, is the instantaneous internal pressure simply 1,000 G = 1,000 atmospheres?