Bare-handed bottle smash

DANGEROUS DEMONSTRATION! If you wear a ring, you might shatter the bottle and slice your hand. And sometimes the whole bottle breaks into razor-edged shrapnel.-----It's quite easy to blow the bottom out of glass bottles... if you know the secret. Even wine bottles sometimes work. But not cider jugs, since the pressure peak is too small if the square inches is large.That vacuum bottle at the start? I made it as follows. (DANGER, explosion hazard!) Find a bottle with a lid, one which is short enough to fit inside a microwave oven. Get an ice cube, save it for later. First de-gas some water by boiling it on the stove for about half an hour. Fill your glass bottle almost full with the boiling hot water. (Careful! The bottle may shatter!) Place a wooden stick inside, then cook it on high in your microwave oven until it starts boiling again (several minutes.) Now remove the wood stick and place the lid loosely on top of the bottle. Cook on medium for several minutes, this replaces the air with live steam as well as heating the metal lid to 100C. Now using gloves, suddenly pop open the microwave door, grab the bottle and screw down the lid, then place the ice-cube on the lid, and put it in the oven for safety. DANGER, THE BOTTLE MIGHT EXPLODE AT THIS TIME! Leave the bottle alone and stay far from the oven. With luck it will cool down without any problem, and the air above the water will have been replaced by a good vacuum.

Channel: Howto & Style
Uploaded: November 30, 1999 at 12:00 am
Author: wbeaty

Length: 02:15
Rating: 4.85
Views: 83476

Tags: amasci  cavitation  demo  demonstrations  demos  dynamics  fluid  hydraulics  physics  science  vacuum  

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