On Mon, Oct 20, 2014 at 4:37 PM, Craig Haynie <cchayniepub...@gmail.com> wrote:
> On 10/20/2014 04:30 PM, H Veeder wrote: > >> In this context the temperature /T/ >> is known >> a-priori >> and >> the output power /q/ >> is known >> a posteriori , so emissivity /ε/ >> will >> adjust the ouptut power downwards >> if >> 0 >> >> < >> >> /ε/ <1 >> >> q = ε σ T^4 A >> >> Harry >> >> > Right, but the internal temperature could be at 1300C but only glow at an > apparent 950C; isn't that how emissivity would change the observed visible > color from that seen on this color chart? > > http://en.wikipedia.org/wiki/Incandescence#mediaviewer/ > File:Incandescence_Color.jpg > > Craig > > /q/ is calculated from T which is the measured surface temperature. It is not necessary to know the internal temperature. A colour chart should only be used when you already know the cause of the illumination. Incandescent illumination is caused by heat. This is a "New World" so we should be careful how we classify the native life. Harry
