  It is proposed that shock wave dynamics within the gas of a small bubble
explain sonoluminescence, the emission of visible radiation. As the bubble
radius oscillates, shock waves develop from spherical sound waves created
inside the gas bubble. As any such shock propagates toward the center, it
strengthens and, upon convergence and subsequent reflection, temperature of gas
inside bubble increases dramatically in such a way that it can produce plasma.
Since main radiation product in exploding epoch, nonadiabatic condition for
imploding shock wave cool plasma and cause exploding shock wave can not
sufficiently rise temperature to produce radiation. In this work we compare
cooling time for plasma by bermsstrahlung radiation with collapsing time for
the imploding shock wave . We find a constraint on radius of bubble with
respect to temperature of water. This constraint condition explains
experimental results as to, why the cold water is fine for SL.
