No, liquid nitrogen is nitrogen that is kept at a really low temperature. It freezes things, and if you get some on your skin it would give you a ‘cold burn’ but it isn’t corrosive. It boils if it comes into contact with warmer things (which is why it makes the really cool smoke effects). If you don’t store it properly, it can vaporise (become gas) too quickly and this may cause the container to explode, which can be very dangerous.
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