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Drag a quark into the circle. The meters will tell you its electric charge (Q) and strangeness (S).
When you add an antiquark to a quark, you will make a meson.
When you put three quarks together, you will build a baryon.
Three antiquarks make an antibaryon.
The quarks have one or two thirds charges, but hadrons only have whole number charge.
Hadrons are held together by the "Strong Force" with exchange particles called gluons.
The electric force has two kinds of charge, which we call positive and negative. Like charges repel, unlike charges attract. The strong force prevents the quarks from flying apart, or moving closer together. It has three charges and three anti charges that work in a way that has similarities to colour, so it is referred to as the colour force.
The gluons can be seen exchanging the colour charges between quarks. For example, a green charge is taken away from a quark by a gluon, which leaves behind either a red or blue charge, which will be the same as the colour of the quark it is heading to. To keep the colour neutral, the gluon also has to carry an antired or antiblue charge
The Pi zero meson is made of a quantum mix of up and down quarks and up and down antiquarks. Drop quarks directly on each other. Include a strange quark to make Eta mesons.
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