The minimum size of the bubble collapse
point is approximately equal to the size of a water molecule.
The size of the
molecule of water = 2,5·10-10 M.
The speed of the bubble collapse is approximately
equal to the speed of sound in water ≈ 1500 m/s.
The speed of sound in water steam is
≈ 400 m / s at t = 00 C and ≈ 500 m / s at t = 1350 C.
Bubble collapse energy: Ecol =
0,5 0,5·v2·m * dR = ρ·Q/8·π·(1/RK-1/R0).
Kladov's formula: Rк ≥ 5 micron - the size
of the bubble, when collapsing, ionization was observed
R0 is the size of the water
molecule. Ecol ≈ 1021 eV ≈ 1600 j. 1 eV = 1.6·10-19 j.