Originally Posted by
HillRider
I've also seen the party tricks of shattering bananas and rubber hoses after dipping them in the liquid. Be careful of storing these containers in a closed room. The evaporating gas could displace enough air to suffocate your guests. This is better done at outside parties.
It's not dangerous in any reasonable quantity that would be employed for personal use (ie, 10L Dewar or similar). It dissipates quickly, doesn't bind to hemoglobin, etc. So there's no real need to keep that sort of quantity ventilated. It won't suffocate anyone - we used it all the time in lab in small rooms.
However, anything at 77K ain't safe unless you know what the hell you're doing (that shattering banana trick can become a shattering hand trick), so it's not a real good idea for parties anyway.
That said, it's also not useful for quick-inflate cartridges as you've mentioned because they'd have to be very large, very cold, or extremely highly pressurized.