Liquid helium is stored at its boiling point 42 k in a, Physics

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Liquid helium is stored at its boiling point 42 k in a

Liquid helium is stored at its boiling point (4.2 K) in a spherical can that is separated by an evacuated region of space from a surrounding shield that is maintained at the temperature of liquid nitrogen (77 K). If the can is 57 cm in diameter and is blackened on the outside so that it acts as a blackbody emitter, how much helium boils away per hour?

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