]:Question about hot glass
Rick Monteverde wrote:
The hot (1800+ degF) and warm (1450+ degF) glass I've worked with
always stays clear. Glass from a furnace is extremely
clear, you can
look at the bottom of the pot and it looks like there's
nothing in there.
In this case it's
Horace Heffner wrote:
On Jul 27, 2009, at 10:07 AM, Stephen A. Lawrence wrote:
Suppose you took a lump of glass and placed it in an (evacuated) oven.
Suppose further that the walls of the oven are dead black, absorbing
(nearly) all radiation which falls on them, and assume that they
The hot (1800+ degF) and warm (1450+ degF) glass I've worked with always
stays clear. Glass from a furnace is extremely clear, you can look at the
bottom of the pot and it looks like there's nothing in there.
The really weird thing is when gold metal gets translucent. Noticed it for
years but
Molten glass at red stage is generally crystal clear. you can find
videos of glass blowing demenstrations on youtube and see for
yourself.
On Wed, Jul 22, 2009 at 6:38 AM, Stephen A. Lawrencesa...@pobox.com wrote:
I ran across an explanation of a blackbody which I actually understood
a week or
Rick Monteverde wrote:
The hot (1800+ degF) and warm (1450+ degF) glass I've worked with always
stays clear. Glass from a furnace is extremely clear, you can look at the
bottom of the pot and it looks like there's nothing in there.
In this case it's presumably also not glowing, or at least
Alexander Hollins wrote:
Molten glass at red stage is generally crystal clear. you can find
videos of glass blowing demenstrations on youtube and see for
yourself.
Thanks -- I'll have to look them up.
Issue is that if it's radiating, say, 10% as much as molten platinum
would (with roughly
Stephen A. Lawrence wrote:
Rick Monteverde wrote:
The hot (1800+ degF) and warm (1450+ degF) glass I've worked with always
stays clear. Glass from a furnace is extremely clear, you can look at the
bottom of the pot and it looks like there's nothing in there.
In this case it's presumably
Stephen A. Lawrence wrote:
Stephen A. Lawrence wrote:
Rick Monteverde wrote:
The hot (1800+ degF) and warm (1450+ degF) glass I've worked with always
stays clear. Glass from a furnace is extremely clear, you can look at the
bottom of the pot and it looks like there's nothing in there.
In
Stephen A. Lawrence wrote:
I've seen lead-crystal (very clear) glass being worked at high
temperatures, at Corning many years ago, and as far as I can recall it
did indeed glow bright orange.
After the conversation here I searched through my old slides and found a
photo of what I
On Jul 27, 2009, at 10:07 AM, Stephen A. Lawrence wrote:
Suppose you took a lump of glass and placed it in an (evacuated) oven.
Suppose further that the walls of the oven are dead black, absorbing
(nearly) all radiation which falls on them, and assume that they
radiate
about as you'd
Some great history of black body radiating cavity hole physics:
http://Galileo.phys.Virginia.EDU/classes/252/black_body_radiation.html
http://tinyurl.com/mbra5q
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
In reply to Stephen A. Lawrence's message of Wed, 22 Jul 2009 09:38:15 -0400:
Hi,
[snip]
Does anyone here happen to know if glass also turns opaque (or
semi-opaque) when it's heated to high temperature? (If it is I'll be
amused; if it's not I'll have to go figure out where my reasoning went
off
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