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Teaching Modern Physics - QuarkNet - Fermilab

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They combine via four conservation rules:<br />

1. Conservation of charge (Q)<br />

2. Conservation of Baryon Number (B)<br />

Why? Because certain reactions are not observed.<br />

3. Conservation of Strangeness (S)<br />

Why? Because some reactions are not observed<br />

and because some particles have longer lifetimes.<br />

4. Conservation of Mass (E/p)<br />

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