# Fractional electric charge?

1. Jun 25, 2010

### PrincePhoenix

According to the third paragraph over here,

"Quarks have the unusual characteristic of having a fractional electric charge, unlike the proton and electron, which have integer charges of +1 and -1 respectively."

What does the fractional electric charge mean? Which units are we talking about?

2. Jun 25, 2010

### kaksmet

Fractional electric charge mean that the charge is not an integer, i.e. it is not something like 0, +1, -1, +2, -2... but instead something like 1/2 or 2/3.

In this case the unit is the electric charge of the electron. Most particles have an electric charge which is a multiple of the electron charge. Actually, all detected particles except for the quarks.
The quarks come in two types, with charge -1/3 and +2/3 and the anti-quarks have a charge of +1/3 and -2/3.

3. Jun 26, 2010

### PrincePhoenix

Thanks. That cleared it up.

A Electric charge as $Q = T_{3} + Y$ Feb 4, 2017