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I am trying to design a magnetic testing apparatus that needs to remain at -196K for 20 minutes. There is not exactly a straight foreword equation to get a calculation for the evaporation rate of liquid nitrogen. The apparatus looks like this, and I have highlighted the area where the nitrogen will be located:

The calculations that I have have been using are as follows:

Is this equation accurate? Any advice would be appreciated.

Equation source: http://en.wikipedia.org/wiki/Accidental_release_source_terms

Thank you!

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# Evaporation Rate of Liquid Nitrogen

Can you offer guidance or do you also need help?

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