[ahy-suh-spin] /ˈaɪ səˌspɪn/
an internal quantum number used in the classification of elementary particles. Particles which have very similar properties except for those associated with their charge are regarded as forms of the same fundamental particle with different components of the isospin in a certain direction in an imaginary space Also called isobaric spin, isotopic spin
A vector quantity of quantum systems (especially subatomic particles) that is conserved in strong interactions and is used to characterize particles that are affected equally by the strong force but have other dissimilar properties, such as different electric charges. For example, protons and neutrons, which are indistinguishable with respect to strong force interactions, have the same isospin. Also called isotopic spin. See also baryon number, strangeness.
1. . abbreviation 1. isthmus isthmus
- Is that a fact
Also, is that so? Phrases indicating that one is following what another person is saying. These expressions, which require no reply, can be used either straightforwardly, as in You mean you’ve flown to Paris three times just this month? Is that a fact? or sarcastically, expressing disbelief or contempt, as in Just wait, I’ll be […]
- Is the pope polish
sentence That was a stupid question; isn’t the answer very obvious? DOES A BEAR SHIT IN THE WOODS [1970s+; first variant used since the accession of John Paul II]
isthmectomy isth·mec·to·my (ĭs-měk’tə-mē, ĭsth-) n. Excision of the midportion of the thyroid.