"charlie" wrote in message
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"Ed Huntress" wrote in message
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"Gunner" wrote in message
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On Sun, 24 Feb 2008 13:03:20 -0800 (PST), "
wrote:

On Feb 24, 4:54 am, wrote:
can anyone tell me that what is fludity in cast iron???should it be
more or less in c.i??

Isn't being "cast" meaning it is solid? So, there is no fluidity. Must
be trick question on a final exam!

Paul


Glass is solid, yet its considered a "slow liquid"

this is incorrect. glass is classified as an amorphous solid.

http://en.wikipedia.org/wiki/Amorphous

Maybe why all those old lathes wont hold tolerance anymore. The cast
iron has flowed a bit.

G

Gunner

regards,
charlie
http://glassartists.org/chaniarts

There's some truth in both statements, Charlie. Amorphous solids --
non-crystalline solids -- have no distinct melting point. The definition of
the "glass-transition" temperature, which is arbitrarily considered the
temperature at which an amorphous material passes from solid to liquid, is
just a viscosity number grabbed out of thin air.

So, to explain the behavior of glassy, or amorphous solids, teachers have
often described glass, for example, as a "superliquid." The term has no
precise meaning. It's just a handy description.

There are some 250-year-old windows in one of my family's houses that make a
strong case that glass is liquid. They look like wavy gravy at their
bottoms, and it's not a result of being blown as cylinders and then cut and
flattened (which is, of course, the way they were made). They all get wavy
at the same point, on the bottom side. You could say that they're just
especially subject to creep, if you think of them as solid. Or you could say
they're just a very, very viscous liquid.

--
Ed Huntress