Breaking the Bottom Out of a Glass Bottle

Maker Faire 2009. The video demonstrates how cavitation not Pascal's Law or increased air pressure breaks the bottom out of a glass or beer bottle.

Category:

Education

Tags:

• physics
• demonstrations
• maker faire

[wbeaty]

Zeke, ever tried making the "cavitation demonstrator" shown on my old 2007 bare-handed bottle-smash vid? No high speed camera needed, yet cavitation is easily visible.

The secret is: degassed water in good vacuum obtained via microwave superheating!

PS

I wonder how "Time Warp" figured out that bottle-smash contained a high-speed phenomenon, and then got the right explanation? Seems an odd coincidence that my video shows the high speed phenomenon, and supplies the accurate explanation.

[zkossover]

@wbeaty I had forgotten about it, but you're right that would be more obvious and cool. Your videos on cavitation and, well, everything else are awesome. My first stop for any new phenomenon is at your site to see if you've already figured it out.

[GHR573]

on the time he got the bottom of he covered the whole mouth of the bottle so it is air pressure dumb fuck

[zkossover]

@GHR573 Did you actually go through the video in slow motion? The bottle breaks at 3:50 and the hammer is clearly off to the left of the mouth of the bottle.

[23ClassyLady23]

I love reading the comments on here, frat boys still feel there smarter than a professor.

[Foxxie0kun]

@GHR573 You don't seem to realize that it takes a soft surface like flesh to make a tight seal on a bottle of that type unless it is sealed with the lid. The mallet however, was not designed to cover or seal the bottle and thus air can escape and enter the mouth of the bottle freely around the mallet unless the precision is so pinpoint as to stick the convex portion of the mallet's head directly into the mouth of the bottle. I assure you, that is not the case here, so stop calling names child.

[wildkard1991]

cavitation plain and simple. Anyone who disagrees needs to take more than high school physics and chemistry, then reevaluate at a later time.

[whoknows456]

fucking idiot the pascal's principle is only when you slam a cork into the bottle to change the pressure in the fluid, and since the area at the bottom is bigger, the force on it is bigger too. so bang.

effing tool.

[GHR573]

@zkossover sure (rolls his eyes) reeeetaaaaard

[mojavedude250]

i also saw this on time warp. they got some great close up slo mo shots!!!