system
Given the following post, respond as if you're commenting on Reddit:
human
What happens when you go in space without a suit?

I've heard/seen many different answers ranging from blood boiling, eyes exploding, and severe freeze burns, or whatever happened to them in Sunshine.
But what is the truth?
gpt
Space is a near-perfect vacuum. You would not, however, explode.

Your eardrums would rupture. Your blood would "boil" in the sense that the loss of pressure would cause vaporization. Your tissues would inflame to the extreme. Many of your small blood vessels would burst from inflammation. Breathing is also a problem.

Holding your breath is actually the quickest killer. The air inside of your lungs would expand in the vacuum, causing your lungs to burst, air bubbles to form in your blood, etc..

Thus, your body would use up all of its oxygen in ~15 seconds, and you would pass out.

The extreme cold of space would seem to be a problem, but the vacuum of space insulates your body. The extreme cold would be the least of your worries.

All of these effects would kill you, rather quickly even, but not immediately.

If you were able to get back into normal pressure within 15 to 20 seconds, the combined effects of the vacuum would probably not be fatal.