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: Hello and sorry if my English is not very good. : I would like to ask you about two matters that : I haven't been able to solve by any means. : 1. What is exactly the "fog" that forms over the surface of liquid nitrogen, is it nitrogen (evaporated and recondensed in small droplets)? or is it atmospheric moisture that condenses due to the low temperature? : 2. I have read that the spin gyromagnetic ratio of a particle can be positive(proton,electron)or negative(neutron).Does the sign of the spin gyromagnetic ratio have any physical meaning from the experimental point of view? How can we find out it experimentally? What are the "observables" implications of the sign?. : Thank you for your answers.

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