Tuesday, May 21, 2013

Is Glass a Liquid at Room Temperature?

The famous North Rose Window at Notre Dame cathedral in Paris dates from 1250.

Most of us have heard the story: Medieval cathedrals have window glass that's thicker at the bottom than at the top.

That happens, we were told, because glass is a liquid at room temperature, and over the centuries, it slowly flowed downward.

But recently, scientists examined a sample of 20-million-year-old Dominican amber, a naturally occurring glass. They found that the structure of the amber did not change with stress or heat any more than a newer sample would. What's going on?                                       

No comments:

Post a Comment

Related Posts Plugin for WordPress, Blogger...