Champagne bottles aren't very tough, are they?

next time you try this in the cellar, please stay away from Jay's roast beef
 
Well, there's a lot of pressure pushing out from within, right? So the glass is already under load when it's struck.

Have to try that some time, with someone else's stemware.

I bet it doesn't work with petillant.
 
Glass is very vulnerable to small surface injuries that propagate. Did you ever cut glass tubing in chemistry class by making a little scratch with a file?
 
My only chem lab experience was a very long time ago. (IIRC we made sodium hexanitrocobaltate -- which I remember because I like the sound of it -- which was just some orange junk, but the point was to predict then measure the yield.)

But I have seen plenty of tile guys make a scratch on the vitreous surface and then snap the piece cleanly on the line.
 
originally posted by Jeff Grossman:
My only chem lab experience was a very long time ago. (IIRC we made sodium hexanitrocobaltate -- which I remember because I like the sound of it -- which was just some orange junk, but the point was to predict then measure the yield.)

But I have seen plenty of tile guys make a scratch on the vitreous surface and then snap the piece cleanly on the line.

It's all about the surface tension.

Mark Lipton
 
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