| General > General Technical Chat |
| Neon |
| << < (5/11) > >> |
| 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. |
| Navigation |
| Message Index |
| Next page |
| Previous page |