[arpa]

Genuinely curious person here. What is the key reason to use photon size instead of wavelenght? To stress the quantifiableness of the radiation being capured by the thermal camera? To be honest it is the first time i've seen photon size semicasually mentioned in a conversation. Then again i only had physics in high school.

[acqq]

> What is the key reason to use photon size

Photon size wasn't used. Micron is an unofficial name for 1e-6 m, the lengths of 0.7e-6 m to 1e-3 m correspond to the wavelength of infrared radiation:

https://en.wikipedia.org/wiki/Infrared

So "those 10 micron photons" there mean "the photons of the radiation with the wavelength of 1e-6 m."

[arpa]

Ah! Makes so much more sense, thanks!

[tagrun]

They're the same thing: de Broglie wavelength would be the closest thing if you want to assign an effective "size" to a particle.

[arpa]

That actually makes a lot of sense after a bit of Wikipediaing. Thank you for broadening my knowledge.