Sorry to interrupt, but I noticed you didn't use superscript. Sentences with expressions like the ones you used are much easier to read if you do. Here's how yours turns out:
The volume of a typical interstellar cloud is 4.43*1044 m3. Divide that by 1057 and you get 4.43*10-13 m3. Each hydrogen gas takes up a volume of 6.2*10-31 m3. I'd hardly call that condensed.
It's a bit of a bore editing it, but your readers will thank you.