This particle is the electron.
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This is a difficult question because size doesn't really apply to particle physics, even less when one considers particle-wave dualities. Of all the particles that can be considered as "matter", muon neutrinos (νμ) are currently understood as the lightest, with a mass of about 170 keV, or around 3.311 x 10-31 kilograms.
On the other hand, forces are also carried by (non-matter) particles, photons (mediate the electromagnetic force) and gluons (mediate the strong nuclear force) are both known to have zero mass.
observable ? i'd say quarks.
viruses are the smallest pathogens
roc is the smallest
The more particle is given the less water would go through it leaving the particle wet
the smallest adult is dwarfs.