[time-nuts] Lifetime of glass containers

[Neville Michie]

Hi,
I used to work with a scientific glass blower who told me that the  
glass is a liquid story is bunk.
He demonstrated by making a "hot spot" on the side of a piece of  
glass pipe. As it cooled it set a
a very intense strain into the piece of glass. Between crossed  
polaroids it was very visible.
He explained that it was beyond the strength of the glass and that it  
would break.
  The only question was when. One second, one hour, one week, one  
year..........
Four years later it fell out, although the force was enormous and the  
distance to move
was submicroscopic there was no decrease of the force.
He also showed with the crossed polaroids, that decade old glass ware  
still had all its strains.
Glass may be a supercooled liquid in structure, but it is also a  
solid, more stable that most metals.
cheers, Neville Michie



On 16/06/2009, at 5:23 AM, Hal Murray wrote:

>
> dave at uk-ar.co.uk said:
>> Or as someone else suggested, use a Glass container.   So long as you
>> don't want it to last for many 100's of years, as Glass is not a
>> solid, it is a "super cooled fluid" and as such it flows like Ice  
>> over
>> time, just that it takes much much longer to do so!
>
> As best as I can tell, the glass-is-a-liquid story is bunk.
>   http://en.wikipedia.org/wiki/Glass#Behavior_of_antique_glass
>
> I was going to ask if anybody had tried to measure it.  That seems  
> like something a time-nut would know about.
>
> The astronomers have been running tests for years.  Their mirrors  
> don't seem to sag enough to notice, and they are very good at  
> noticing tiny distortions.
>
> -- 
> These are my opinions, not necessarily my employer's.  I hate spam.
>
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/ 
> time-nuts
> and follow the instructions there.