Liquid nitrogen is colorless, odorless (very similar to water) like nitrogen gas. As mentioned, liquid nitrogen is obtained by fractional distillation of air (in other words, it is liquefied under high pressure). A given volume of liquid nitrogen is approximately 700 times more compact than nitrogen gas under normal conditions. At atmospheric pressure, liquid nitrogen boils at 77 Kelvin, which is -196 ° C and -321 ° F, and is converted back to gas.
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