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Most of the gas in the Galactic disk is in a unionized or neutral state, and is termed H I. Under the right conditions, such as near a hot star or after a supernova explosion, the gas can become ionized, and these places are called H II regions. The gas in both states is more generally called the interstellar medium or ISM...
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The gas in both states is more generally called the interstellar medium or ISM. H II regions are hot (?104 K) and sit in a background of ``cold'' (??102 K) H I. H II regions stand out very clearly on direct photographs (or CCD images) of external galaxies. This is because they are dominated by emission lines of various species, such as hydrogen itself, but also helium, oxygen, carbon, calcium, silicon, iron etc...
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