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A long time ago I was a chemistry teacher.
But, to be honest, I couldn't remember whether Nitrogen stayed molecular when liquified or not.
I just used N2 because I knew people would know what I was talking about and I could save 6 keystrokes.
chuck
LN2
is the preferred shorthand for liquid nitrogen.
A gas at standard temperature and pressure (room temperature of 300 kelvin and 1 atmosphere), nitrogen can be liquified under pressure. The compression causes a large amount of heat to be liberated, which is removed as waste.
When the liquid is esposed to standard conditions, the nitrogen molecules will desire to return to a gaseous state, their preferrence under such conditions. As a result, the liquid boils, taking with it both heat from the environment (providing cooling power) as well as from the liquid itself. As a result, the bulk liquid will quickly be cooled to 77K, the boiling point of nitrogen at 1 atmosphere.
For next time, please draw a phase diagram of N2 showing the gaseous, liquid and solid phases, as well as arrows showing the various phase transitions: evaporation, condensation, freezing, meltin and sublimation.
For extra credit, please find the correct antonym for sublimation.
And, I'm still waiting for essays from some of you. I'm serious people, this is my job!
trippin'
I had an excellent chem professor at UC Berkeley named Jolley--even asked him a question about Nitrogen once after class, specifically, what makes NI3 so unstable & exothermic.
---e
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