General > General Technical Chat
Neon
Cerebus:
--- Quote from: westfw on March 17, 2022, 08:28:59 am ---$1/l of gas sounds pretty expensive to me. I believe 1l is about 1g…
--- End quote ---
Ah, I see we've forgotten high school physics. 1 mole of any gas occupies 22.41 litres at STP (Avogadro's law + ideal gas law), neon has an atomic weight of 20.1797(6) so it's going to be closer to 900mg.
I'm quite surprised to have remembered that 22.41 litres because I don't think I've ever had a practical use for the figure in the 50 odd years since I learnt it.
Sal Ammoniac:
--- Quote from: Cerebus on March 18, 2022, 01:11:03 am ---
--- Quote from: westfw on March 17, 2022, 08:28:59 am ---$1/l of gas sounds pretty expensive to me. I believe 1l is about 1g…
--- End quote ---
Ah, I see we've forgotten high school physics. 1 mole of any gas occupies 22.41 litres at STP (Avogadro's law + ideal gas law), neon has an atomic weight of 20.1797(6) so it's going to be closer to 900mg.
I'm quite surprised to have remembered that 22.41 litres because I don't think I've ever had a practical use for the figure in the 50 odd years since I learnt it.
--- End quote ---
Ah, but 1g is about 900mg.
LaserSteve:
Lamp mixes are 99.9995 or better purity. A trace of Argon can be added to form a Penning mixture to lower the ignition voltage. For neon indicator lamps or trigger tubes used in control circuits a trace of Kr-85 can be added to aid in firing in the dark.
Any trace of oxygen, nitrogen, or hydrogen is bad news in lighting. Mixes for flourescent lamps at one time had a trace of nitrogen to cause heating of the lamp wall to aide in vaporizing the mercury in winter. Nixie mixes could contain a tiny amount of mercury vapor to reduce electrode erosion by sputtering.j
It is difficult to buy neon in less then five or six nines purity unless you order a blend.
The slightest amount of nitrogen raises the firing voltage and switches emission to a more or less dim violet color.
Steve
PlainName:
--- Quote from: Sal Ammoniac on March 18, 2022, 01:58:30 am ---
--- Quote from: Cerebus on March 18, 2022, 01:11:03 am ---
--- Quote from: westfw on March 17, 2022, 08:28:59 am ---$1/l of gas sounds pretty expensive to me. I believe 1l is about 1g…
--- End quote ---
Ah, I see we've forgotten high school physics. 1 mole of any gas occupies 22.41 litres at STP (Avogadro's law + ideal gas law), neon has an atomic weight of 20.1797(6) so it's going to be closer to 900mg.
I'm quite surprised to have remembered that 22.41 litres because I don't think I've ever had a practical use for the figure in the 50 odd years since I learnt it.
--- End quote ---
Ah, but 1g is about 900mg.
--- End quote ---
Sorry, but :-DD
Cerebus:
--- Quote from: Sal Ammoniac on March 18, 2022, 01:58:30 am ---
--- Quote from: Cerebus on March 18, 2022, 01:11:03 am ---
--- Quote from: westfw on March 17, 2022, 08:28:59 am ---$1/l of gas sounds pretty expensive to me. I believe 1l is about 1g…
--- End quote ---
Ah, I see we've forgotten high school physics. 1 mole of any gas occupies 22.41 litres at STP (Avogadro's law + ideal gas law), neon has an atomic weight of 20.1797(6) so it's going to be closer to 900mg.
I'm quite surprised to have remembered that 22.41 litres because I don't think I've ever had a practical use for the figure in the 50 odd years since I learnt it.
--- End quote ---
Ah, but 1g is about 900mg.
--- End quote ---
Ah, a man who only ever uses E6 series resistors.
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