system
Given the following post, respond as if you're commenting on Reddit:
human
[Avengers] Why didn't the portal suck out the Earth's atmsophere?

The thing connected to open space and they obviously had no control over what went through it (could have stopped the nuke otherwise) so what happened? A 50m hole in the sky is a pretty big leak.
gpt
Earth's atmosphere is very large, and its pressure is not very high. Assuming the other side of the portal was a vacuum, we'd be losing air at about a rate of 793,000 m^3 / s. By comparison, Earth's atmosphere measures roughly 51,000,000,000,000,000,000 m^3 . If the fight lasted for about a half hour, we would have lost 0.0000000028% of our atmosphere.