Actually this is something that would be quite
hard to do. As you might now, space is pretty
close to being what we call a vacuum; this just means that it doesn't have much stuff in it. In contrast, air consists of a few different gases, so in any sample of air there are many atoms and molecules all whizzing about.
If you took a box of air up into space and made a small hole in it, the effect would be similar to taking an inflated balloon (which contains a higher concentration of air than the outside) and
pricking it with a pin. You might want to give this a try if it's been a while since you've done
it! Because the atoms and molecules that make up
air like to be evenly distributed rather than
bunched up in one place, they come rushing out of
the balloon. The balloon ends up deflated because
the plastic that its made of doesn't have any
structural rigidity of its own; its shape was
maintained by the excess air pressure. Notice also
that it flies off in the opposite direction to the
hole; it does this to balance out the gasses that
have rushed out of the hole side (you might have
come across this concept in class as "conservation
Releasing air in space would be similar, but a lot more dramatic, since the difference between normal air and a vacuum is a lot bigger than the difference between air inside a balloon and normal air.
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