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[nlreefguy]

Originally Posted by Aquaria

If I remember correctly it is only stays liquid when under pressure but as I type this it sounds wrong so I prob am to

NO you are right. The natural form for nitrogen in normal atmospheric pressure and exposed to normal room temperature is gas. The only way to reduce the temp of the gas to the point that it becomes liquid is by high pressure.

[shrimpchips]

Liquid nitrogen stays liquid in insulated containers not under pressure - the rate of evporation is considerably lowered so that you need to replenish it only once every few weeks/months depending on how often the container is opened.

It's how we store cells and tissues for long term storage. Cryopreservation of mammalian cells is well established and routine - it's actually pretty easy to do, and you can store tissues and cells for decades.