Focus with a bottle

Scientists have shown that the bottom of the bottles with aerated liquid is broken upon impact hand because that fluid cavitation occurs.

To understand the nature of the behavior of the fluid physics put on the bottom of the vessel and an accelerometer recorded experiment on high-speed video. It turned out that the beginning of breakage occurs much later than the impact itself. At the moment of impact at the bottom of the bottle pressure drops sharply, causing boiling of the liquid and the formation of voids - cavitation. Immediately after the collapse of the bubbles, the rate of collapse is about 10 times greater than the rate of formation of voids. The resulting shock wave hits the glass and cause its destruction.

via factroom.ru