Answer 1:
N2 nitrogen is a gas at room
temperature, but by cooling N2 it can
be turned into liquid nitrogen at about 77 degrees
Kelvin or -326 degrees Fahrenheit. The
temperature right now is about 70 deg Fahrenheit.
Because 77 Kelvin is such a low temperature,
most things freeze instantly when dropped into
liquid N2. Read more
here
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Answer 2:
It doesn't. Nitrogen is the most common gas in
Earth's atmosphere; about 80% of the air is
nitrogen. If it froze everything it touches, then
you would be dead, because it would freeze you.
You're probably thinking about liquid
nitrogen. Nitrogen boils at a temperature of
77 Kelvin, or -196 Centigrades. Therefore, in
order for nitrogen to be liquid, it must be below
that temperature. Because water freezes at 273
K (0 C), anything with water in it will freeze in
contact with liquid nitrogen.
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