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Old February 11th 19, 08:11 PM posted to sci.astro.research
Edward Prochak
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Default Cosmological Problems

[[Mod. note -- I apologise for the delay in posting this article
(the delay was caused by a mistake on my part). This article was
received by the s.a.r moderation system on 2019-02-06.
-- jt]]

On Tuesday, February 5, 2019 at 10:44:44 AM UTC-5, Steve Willner wrote:
I wrote:
In practice, the term
"visible" often refers to light detectable by instrumentation
suitable for visible light, say from 300 nm (the atmospheric cutoff)
to 1000 nm (the intrinsic silicon limit).


In article ,
Jos Bergervoet writes:
(In the same fashion, this silicon is a 'metal' of course!)


Heh. (Silicon is a semiconductor, not a metal, for anyone who is
confused.) I reported how the language is used in practice. Human
language is not always logical. I don't think I've seen silicon
described as a metal, but it wouldn't shock me. Actually, come to
think of it, doesn't silicon become a metal at very high pressure?


I suspect Jos was hinting at the astro view of metals,
IOW, there is hydrogen and helium, while the rest are metals.

Ed