How many are there in a cubic in inch?
The number density of each neutrino species is theorized to be about 56 per cubic centimeter, for a total number density of around 150 neutrinos per cubic centimeter.
That's about 2500 per cubic inch.
where did you get that information, if you don't mind my asking
Simpson, John J., The Sudbury Neutrino Observatory, AAPT Summer Meeting, AAPT Announcer 30, 71, Summer 2000
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