eta-c meson

[ey-tuh-see, ee-tuh-]

eta-c meson

[ey-tuh-see, ee-tuh-]
noun Physics.
a neutral meson having a mass 5832 times that of the electron and a mean lifetime of approximately 3.1 × 10-22 seconds.
Also called eta-c particle.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Eta-c meson is always a great word to know.
So is fluidity. Does it mean:
the ability of a substance to flow; a measure of this ability, the reciprocal of the coefficient of viscosity
the electric or magnetic force that acts between oppositely charged bodies, tending to draw them together
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