2 Responses to “silica emissivity”

1. admin says:

   December 28 at 2:41 am

   I have a source that references: Raznjevic, K., "Handbook of Thermodynamic
   Tables and Charts"; McGraw-Hill, NY, 1976
   and lists: Quartz, fused, rough at 293K (20 C) normal emissivity of 0.93 and
   Glass, smooth, 293K: normal emissivity 0.93.
   Hemispherical emissivity approx. equals 0.95*normal emissivity for smooth
   surfaces other than bright metals, and 0.98*normal emissivity for other
   rough surfaces.
   

   Another possible source is "CRC Handbook of Chemistry and Physics"

   - Hide quoted text — Show quoted text -

   Cyril COCQ wrote in message <35D98703.1FCA…@cnet.francetelecom.fr>…
   >I’m looking for the emissivity properties of the silica between 20°C and
   >2500°C
   >does someone know where I can find this values (on the web or on any
   >other place)?
   

   >thanks

   >Cyril Cocq
2. admin says:

   December 28 at 2:41 am

   S Crook wrote:

   > I have a source that references: Raznjevic, K., "Handbook of Thermodynamic
   > Tables and Charts"; McGraw-Hill, NY, 1976
   > and lists: Quartz, fused, rough at 293K (20 C) normal emissivity of 0.93 and
   > Glass, smooth, 293K: normal emissivity 0.93.

   Why does hot glass glow almost like almost black body?

   If somebody answers "Because it has a low reflectivity", then my next
   question would be "Why does not air glow?"

   And on a microscopic level: What transitions is the radiation due to?
   —
   Pieter.Kui…@itn.hh.se                  http://www.hh.se/staff/piku/