In The Avengers, Loki says to Thor, “The humans think us immortal; let’s put that to the test”, and drops the glass chamber.
Loki clearly knows that Thor is an immortal and he is doing this to scatter the Avengers, so what would have happened if the glass chamber reached the ground before Thor could break it??
Would Thor have been killed or injured?
Loki clearly knows that Thor is an immortal
~> Seriously, what makes you think so...