“While many subatomic particles are considered points, and thus could be thought of as having an infinite density, the neutron has a measurable size (about 10-15 m in diameter) as well as mass (about 1.7 x 10-27 kg). Those numbers result in a density of about 1018 kg/m3.
That value matches the estimated density of neutron stars, the densest objects known in the Universe. (A black hole’s mass is concentrated in an immeasurable singularity). A single neutron is a smaller (MUCH smaller!) version of a neutron star, and the Earth is loaded with neutrons.”
“Osmium and Iridium are the two most dense elements in pure form. Osmium has a density of 22.56 gcm3.”
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