[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: (TFT) One-Hex Fire - how much light?

From: Mark Tapley <mtapley@swri.edu>

or, from http://whatis.techtarget.com/definition/0,,sid9_gci542011,00.html

	1 lux = 1.46 milliwatt / m^2

where the whole 1.46 milliwatt has to be visible light (555 nanometer wavelength, which (I think) is yellow).

   Thanks, I needed that.  Couldn't find it anywhere last night.

Spontanious combustion is defined as the tempurature were a
material burns without external oxygen and provides it's own fuel.

Maybe in magic terms. In physics, it means (loosely) the temperature at which a substance will ignite itself (even without a spark). It will still need oxygen (or some oxidizer - could be H2O2 or something) to burn, but because it could ignite pretty much all at once, it will burn *fast* once it starts.

   As Homer Simpson said  "Doh!"

celcius      material spontaniously combusts
  230            linseed oil
  200            leaves
  159            wood
  140            drying oil paints
  100            green hay
   95            cotton
   65 - 121      animal feed
   30 - 40       damp coal

Some of the numbers on this table are highly suspect. Damp coal will gang-fire at 30 C = 86 F !??!? On a hot summer day, Pennsylvania could erupt. Cotton in a double-boiler will explode??? I don't believe it.

LOL! News anchorman voice "Pennsylvania errupted again yesterday." Sorry it wasn't labeled properly. But the numbers above are celcius.

For black-body radiation ....

Nice work. So one could say that shadowights just see in a different frequency than normal.

  David Michael Grouchy II

Get MSN 8 Dial-up Internet Service FREE for one month. Limited time offer-- sign up now! http://join.msn.com/?page=dept/dialup
Post to the entire list by writing to tft@brainiac.com.
Unsubscribe by mailing to majordomo@brainiac.com with the message body
"unsubscribe tft"