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Q & A: phases of nitrogen

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Most recent answer: 10/22/2007
Q:
How do you make gaseus nitrogen turn into solid nitrogen without going through the liquid state?
- Jake
Harrisonville Middle School, MO
A:
You could cool it at very low pressure. At low enough pressure the gas converts directly to solid. I believe, based on a quick Google search, that the necessary pressure is below 12.5 kPa. That's about 1/8 of atmospheric pressure. At 12.5 kPa the freezing temperature is 63.18 K.

Mike W.

(published on 10/22/2007)

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