Two viewers (one on YouTube, one on LinkedIn) asked closely related questions about the relationship between ionization degree and plasma temperature. Time for a slightly deeper dive than usual. The answer requires realizing there isn't one temperature. There are four.

⏱️ Chapters

00:00 Two questions, closely related, one YouTube, one LinkedIn

00:03 Both about ionization degree and temperature

00:12 The first question: is ionization related to temperature?

00:38 The second question: why do cold atmospheric plasmas stay cold if electrons are at 1 eV?

01:30 What is temperature? Not what you think.

01:34 A molecule has 4 degrees of freedom

01:47 Rotation

01:51 Vibration

01:56 Translation

02:03 Electronic (my favorite)

02:07 The crowded-room analogy setup

02:29 Rotation: st ...