|weak interaction or weak force|
|physics interaction See electroweak interaction weak nuclear interaction, Also called: weak nuclear force an interaction between elementary particles that is responsible for certain decay processes, operates at distances less than about 10--15 metres, and is 1012 times weaker than the strong interaction. The weak interaction and electromagnetic interactions are now described by the unifying electroweak theory|
|weak force or weak force|
|a scrap or morsel of food left at a meal.|
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|weak force (wēk) Pronunciation Key
The fundamental force that acts between leptons and is involved in the decay of hadrons. The weak nuclear force is responsible for nuclear beta decay (by changing the flavor of quarks) and for neutrino absorption and emission. It is mediated by the intermediate vector bosons (the W boson and the Z boson), and is weaker than the strong nuclear force and the electromagnetic force but stronger than gravity. Some scientists believe that the weak nuclear force and the electromagnetic force are both aspects of a single force called the electroweak force. Also called weak nuclear force, weak interaction. Compare electromagnetic force.