Air ionization temperature

  • #1
Need help here to determine correct temperature when the air turned into plasma, because there is someone in other forum (not here) insisted that a 15000000 degree Celcius flame is flame, not plasma, but I think at that temperature air must already becoming plasma.
 
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Answers and Replies

  • #3
521
70
The higher the temperature of air is the more ions it will contain. Even at room temperature there are a few ions that are mostly generated by radiation.
A candle flame contains a lot more ions. Put a burning candle into a microwave oven and you get a nice plasma ball because the flame is so conductive it absorbs most of the microwaves. What percentage of air molecules must be ionized to call it a plasma is not clearly defined. So you can't give an exact temperature at which air turns into plasma. The hotter it is the more it is ionized.
 
  • #4
PhysicoRaj
Gold Member
479
35
But without the influence of any radiation, or electric fields, etc., using only heat as the source, still can it have a vague ionization temperature??:confused:??
 
  • #6
667
4
At 3000K oxygen dissociates significantly into neutral individual atoms. Nitrogen needs several 1000K more. Significant ionization takes a hotter temperature. But very slight ionization happens before.

You can look for the ionization energy and divide it by R (if moles, or by k if molecules) to get a temperature where oxygen is half-way ionized.
 

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