Cannister of liquefied nitrogen?

I'm binge-watching this show, I'm currently about halfway through season 3. When Helena escaped from the Prolethian farm, she took a can of compressed gas (nitrogen I think) and later hid it in Felix's apartment just before she got abducted. An episode or two later little Kira discovered it, but now she's in Iceland. Whatever became of it?

Thanks!

Cannister of liquefied nitrogen?