how hot does glass have to melt into a liquid
our 100 year old barn just burned to the ground and l found a glass icicle
hanging from a tractor headlight and we wanted to know how hot the fire
was. thanks
Glass will fuse flat at about 1550F & flow around objects at up
to 100F below that. If the bulb had an icicle, it was exposed to temps in
that area at least for a while. It can sag & droop in the 1250-1300F
range. Since it was a tractor, perhaps there was extra local heating
from the fuel in the tractor.
Glass is an amorphous solid, meaning it is not crystalline, but is hard
as rock. Liquids are amorphous but that does not mean amorphous solids are liquid - just a bit like one. A supercooled liquid is a liquid - like water cooled to 30F that instantly forms ice when a crystal is added.
Depending on it is composition, glass has a melting point of
1400-1600 °C.
http://hypertextbook.com/facts/2002/SaiLee.shtml
Pure silica (SiO2) has a ''glass melting point''— at a viscosity of 10
Pa·s (100 P)— of over 2300 °C (4200 °F). http://en.wikipedia.org/wiki/Glass
If the ''icicle'' was glass, the fire reached approximately
2000 degrees F. That sounds kind of high for a barn fire - it might have
been a plexiglass or similar material.
FYI: Glass is an amorphous solid - kind of like a material between a
solid and a liquid.
glass is already a liquid or more pacifically a ''supercooled
liquid''
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