426 
igh dP a n[ p+ 8@)] (5.1) 
where ) is a constant and B a function of IE only. This equation has 
been shown by Gibson and Bridgman to represent compressibility data for water 
at pressures up to 350,000 1b/in.”. For our purposes, we employ a modified 
form of the Tait equation along an adiabatic in the form, 
Moe), , Fp Bs)) re 
Eqe 5e2 is of a more reasonable form than the isothermal Tait equation for 
use at very high pressures, since the latter permits a state of zero volume 
for finite pressure and in consequence must overestimate the sound velocity 
at high pressures. The adiabatic of sea water (taken to be 0.7 molal HCl 
solution) passing through 1 atmosphere and 20° C. is adequately represented 
Beene tow icriin i715 De =. 3/047) kilobare-“*2q,, 562 peraits the calcu 
lation by straightforward methods of the shock*front conditions (Eq. 2.2) 
and of the enthalpy @) , acoustic velocity ¢ , and Riemann function o& as 
functions of the shock-front pressure. The results for sea water initially 
at 20° C. are listed in Table 5.1 for shock-front pressures up to 80 
kilobars,24/ 
In the further discussion of the propagation theory, it is necessary 
to employ various explicit relations for the various variables behind the 
21/ The quantities mn and were supplied by R. E. Gibson. 
22/ 4. G. Kirkwood and J, M. Richardson, OSRD Report No. 813 (1942). 
See also J. M. Richardson, A. B. Arons, R. R. Halverson, J. Chem. Phys., 
15, 785 (1947). 
39 
