Too good to let go by

[Terry Martin]

Ken Mayer wrote:
> 
> > > Wait a minute.  I thought hydrogen was a metal.
> 
> Hydrogen is a Group 1-A element, together with lithium, sodium, etc.  The
> "light metals" begin with lithium and beryllium, downward through the
> periodic table.  Hydrogen is not classified as a metal because does not
> form a solid containing mobile electrons.
> 
> > Only under the physical parameters that make it a metal. Is glass a
> > solid?
> 
> No, it's a supercooled liquid.  It has a viscosity (very high, of course).
> If you measure the thickness of an old window pane, it will be measurably
> thicker at the bottom.  It also changes its internal structure over time.
> New glass cuts very easily, while old glass tends to shatter.
> 
> Ken
> :-)

Exactly, appearances tend to be deceiving.

Terry