Definition

Noun: * In particle physics, the weak force (also called the weak interaction) is one of the four fundamental forces of nature. It is responsible for processes that change the type, or "flavor," of subatomic particles, such as the radioactive decay of atomic nuclei (e.g., beta decay). It is mediated by the exchange of particles known as intermediate vector bosons (W and Z bosons).

Examples of Usage

• Noun:
  • The weak force is essential for the nuclear fusion processes that power the sun.
  • Beta decay occurs because of the weak force.
  • Unlike gravity or electromagnetism, the weak force has a very short range.

Advanced Usage

• Electroweak Theory/Unification: In the Standard Model of particle physics, the weak force and the electromagnetic force are unified into a single electroweak interaction at very high energies.
  • The electroweak theory successfully describes both the weak force and electromagnetism.

Variants and Related Words

• Weak Interaction: A fully synonymous term for the weak force.
• Weak Nuclear Force: Another common synonym, explicitly naming it as one of the nuclear forces.
• Electroweak Force: The unified force combining the weak and electromagnetic interactions.

Synonyms

• Weak interaction
• Weak nuclear force

Related Phrases

• Weak isospin: A quantum number associated with the weak force.
  • Particles have specific values of weak isospin.
• Weak hypercharge: Another quantum number in the electroweak theory.
• To mediate the weak force: Describes the action of the W and Z bosons.
  • The W boson mediates the weak force in charged-current interactions.

Noun

1. (physics) an interaction between elementary particles involving neutrinos or antineutrinos that is responsible for certain kinds of radioactive decay; mediated by intermediate vector bosons