You are sentient star dust

Space isn't my area of expertise, and I doubt you want a lesson on all the ways blast pressure can fuck up a human body, so I'll defer to funk on this

Yes explosions can cause expansions... expansions of air in a space of area. The difference is that the big bang was an expansion of space itself. This is something an explosion cannot do.

So, yes, I can, sorry for being late... i was snoozing.

Do explosions have to be air-related?

It's a condition. Also usually explosions involve oxygen. technically a star going supernova isn't an explosion either, it's actually an implosion.

I feel like you're mistaking "explosion" for something like "combustion", but I think we've identified our semantic difference either way.

Well, the literal definition is: a violent and destructive shattering or blowing apart of something, as is caused by a bomb.
I mean, as it rapidly created spacetime, it doesn't fit the idea of it being destructive, although it was probably pretty violent.
But yeah, it's w/e, i'm just being petty.