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This is how we represent the up quark visually
The particle itself is a fundamental particle and it is too small to be seen
by any imaginable instrument of observation
So we instead represent the properties that allow the up quark to interact
The central small dot represents the weak charge of the up quark
This charge entirely separate of electric charge gives rise to the weak nuclear force
This force causes up quarks and down quarks to swap flavors
and its typical range is much smaller than the diameter of a proton
Surrounding that is the volume depicted as gold for the up quark
This represents the electric charge of the up quark which has a positive charge
of + 2/3 units
The electric charge is the generator of the electromagnetic force which
has infinite range
although the drop off in strength is pretty dramatic as we move away
from the quark
The larger volume of shifting red, green and blue is meant to represent
the color charge
which generates the strong nuclear force
This is the force that holds quarks together in a proton or neutron
and a residuum of this force holds the protons and neutrons together in a nucleus
of an atom
This force is 100 times stronger than the electromagnetic force
but its range is limited to about the size of a proton