How does the composition of an H I Cloud compare to a Molecular Cloud regarding hydrogen state?
Answer
H I Clouds are composed primarily of atomic hydrogen ($ ext{H}$)
The classification of interstellar clouds depends heavily on the physical state of the dominant element, hydrogen. An H I Cloud, often referred to as a neutral atomic hydrogen cloud, is characterized by hydrogen existing predominantly in its atomic form ($ ext{H}$). This contrasts sharply with a Molecular Cloud, where hydrogen exists primarily as molecular hydrogen ($ ext{H}_2$). Furthermore, H I Clouds are generally warmer, typically around $100 ext{ K}$, and are less dense than molecular clouds, making them considerably more transparent to background light sources.
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