To calculate the total strangeness of a composite particle (like a baryon or meson), use the following sum:

The concept of ( ) in particle physics was developed to explain why certain subatomic particles, like kaons and hyperons, lived much longer than expected before decaying.

) it contains. By convention, a strange quark has a strangeness value of , while an anti-strange quark has 2. Apply the Strangeness Formula

Physicists observed that these "strange" particles were always produced in pairs through the strong interaction but decayed individually through the weak interaction. This led to the discovery of the , the fundamental piece of matter that carries this property. 1. Identify the Quark Composition

The strangeness of a particle is determined by the number of strange quarks ( ) and strange antiquarks (

S=(number of s̄ quarks)−(number of s quarks)cap S equals open paren number of s bar quarks close paren minus open paren number of s quarks close paren 3. Check for Conservation

When developing a "piece" of a reaction (an equation), you must ensure that total strangeness is conserved in strong and electromagnetic interactions.