439 
The peak pressure at large distances is not proportional to the 
initial pressure at the gas sphere surface, roughly a or Pp £2, » but 
varies only as the square root of this quantity pe e Since the peak 
pressure contains the factor Ba which measures the time of decay on the 
surface, it will be larger the more sustained the pressure is at the sur- 
face of the gas sphere. In the asymptotic peakepressure formulas the explo- 
sive is completely characterized by the ratio Rx or 6,R /@, . 
Recalling the definition of A. >» Eqe 5017, we find 
G 
, ¢, p 
8 = At Ae. A? (6.4) 
for times GS sufficiently large to permit the neglect of G.¢ tx) in com- 
parison with G, in the expression for 8, - With the use of Eq. 6.4, the 
peakepressure Eq. 6.3 may be written in the form 
V2 
F = =" p C - ic 
ny A 4 hog R/a, ) 
Tv, (6.5) 
Gare GImarv , 
0 
The peak pressure is thus determined by % » the time integral of Gt) 
over the interval iS » and not by the initial value Gx on the gas sphere. 
The result is independent of the form of G, (Ga) ea 
After a time 7, long in comparison with the time of decay of the 
pressure at the gas sphere surface, we might expect YC to approach a constant 
2 
value l, « This is not quite correct since the afterflow term QU / & in 
52 
