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there is a plus side, releasing nitrogen into the air is helpful to the enviroment I beleive, as it speeds along the human interrupted nitrogen cycle in the wilderness. But why cant nitrogen be used like any other refrigerant?
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The Earth's atmosphere is almost all Nitrogen with a little oxygen and traces of water + CO2 + Argon. The nitrogen cycle refers to ionic nitrogen + hydrogen compounds like ammonium nitrate needed by plants.
Anyway LN2 is pretty cheap stuff. Chem majors throw the stuff around because its virtually worthless. It is, however, difficult to store which makes it impractical for us to use
