Charles Link's latest activity

He was one of the smarter ones on here. We will miss him.

@DaveC426913 I am still waiting to see most of the geese fly south. I don't think most of them have gone south yet. If they did, I...

I don't know what it's like elsewhere, but we didn't get fall here. The trees were still green as October turned into November. They've...

Granddaughter: "Poopah, can we build a snowman?" Poopah: "🎵 DO YOU WANNA 🎵BUILD A SNOWMAAAAAAA—" Granddaughter: "NO Poopah! Not THAT...

Yesterday I built a snowman for the first time this millenium. Grandkids were going stir crazy and every else was too busy or too...

The above is a photo of a 4'6" snowman that I made today, Monday 11-10-25, in Chicago. It is the first one for this season. We had...

In that case, one would need additional spectral detail, such as measuring with two or more bands.

I was able to use it to determine the temperature of a calibration blackbody source with known aperture size at close range, ( distance...

I think the problem is more difficult than that- the emissivity can vary wildly over the relevant waveband (especially either MWIR or...

I imagine the surface electron activity in 'cool condensed matter' will be subject to that much more than surfaces of stars at thousands...

Add more cool geology pictures if you have them.

I think it is probably impractical and perhaps almost impossible to use Stefan's law, (which is the power radiated over the complete...

So it's still a single colour analysis except for some special applications? I guess that way is chosen because the 'numbers' allow /...

Perhaps we should include a little more detail. Stefan's law is ## M=\sigma T^4 ## where ## M ## is ## \pi ## times the integral of...