Liquid Nitrogen Freeze-Ray Vs Flamethrower? Any Guesses Who’s Gonna Win This One?

There are commercial liquid nitrogen guns used by dermatologists to freeze warts and skin cancer off. It is believed they have a pressure release valve that keeps the pressure at around 70psi. The problem is its hard to make a thermos thats also pressure rated because you have a pressure on the inside of the flask, then a vacuum directly on the other side. They are fragile and expensive. He tried to put a nichrome heating element inside the thermos to increase pressure, but it ended up not working that great. shaking the thermos made way more pressure!

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