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First, your typical neutral plasmas contain both ions and electrons. The ions may be polyatomic or monoatomic. There also exist non neutral plasmas, which are composed of only ions or electrons. Plasmas in the laboratory are typically (though not necessarily) created by first injecting a gas into a vacuum chamber and then first ionizing that gas using ...


A plasma can be comprised of molecules so long as the temperature of the plasma is sufficient to ionize the molecule without dissociating it. Note that most definitions of plasmas do not really require a percentage of ionization (e.g., a gas that has only 1% of it ionized is considered a "cold" plasma whereas something much more than this is usually ...


Yes, a plasma contains positive ions and negative electrons, but the positive ions don't need to be atoms. Actually the negative charges don't even need to be electrons. For example, plasma etching of silcon is done using a sulphur hexafluoride plasma that consists of (mainly) SF$_5^+$ and F$^-$ ions. I'm not sure that the word plasma has a precise ...


It's dangerous because if you pour too much liquid nitrogen, or too fast, then your skin will freeze and you end up with a terrible headache (or death). See Wikipedia for what the Leidenfrost effect is.

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