How do ionized, molecular and atomic gases differ in temperature and particle concentration in interstellar space?

The temperature of the ionized gas is about 10,000 K, the temperature of the atomic gas is several hundred Kelvin, the molecular gas is very cold, its temperature does not exceed 10-20 K. Molecular clouds are the densest parts of the interstellar gas, the atomic gas is less dense, and the ionized gas is highly rarefied.

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