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<blockquote data-quote="Billy Y." data-source="post: 76514" data-attributes="member: 10157">Except....Glass, even though it feels solid, is actually still in it's liquid form.&nbsp; So, the longer your glass sits the more small distortions it will take on, although we are talking about 100's of years here.&nbsp; Glass measured in the 400+ year old cathedrals of Europe has been found to be actually running down, meaning it is much thicker now at the bottom of the window than at the top, and displays a lot of distortions throughout.&nbsp; Now, before you all freak out on your old lenses, i am sure we have much better glass technology now than they did when they built those cathedrals.Ok, i stand corrected - and this is from the Math.ucr.edu website - &quot;Some people claim that glass is actually a supercooled liquid because there is no first order phase transition as it cools, which is true.&nbsp; In fact, there is a second order transition between the supercooled liquid state and the glass state, so a distinction can still be drawn.&quot;</blockquote>

[QUOTE="Billy Y., post: 76514, member: 10157"] Except....Glass, even though it feels solid, is actually still in it's liquid form. So, the longer your glass sits the more small distortions it will take on, although we are talking about 100's of years here. Glass measured in the 400+ year old cathedrals of Europe has been found to be actually running down, meaning it is much thicker now at the bottom of the window than at the top, and displays a lot of distortions throughout. Now, before you all freak out on your old lenses, i am sure we have much better glass technology now than they did when they built those cathedrals. Ok, i stand corrected - and this is from the Math.ucr.edu website - "Some people claim that glass is actually a supercooled liquid because there is no first order phase transition as it cools, which is true. In fact, there is a [I]second order transition[/I] between the supercooled liquid state and the glass state, so a distinction can still be drawn." [/QUOTE]

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