subatomic
41Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
42relativity — /rel euh tiv i tee/, n. 1. the state or fact of being relative. 2. Physics. a theory, formulated essentially by Albert Einstein, that all motion must be defined relative to a frame of reference and that space and time are relative, rather than… …
43Fermi, Enrico — born Sept. 29, 1901, Rome, Italy died Nov. 28, 1954, Chicago, Ill., U.S. Italian born U.S. physicist. As a professor at the University of Rome, he began the work, later fully developed by P.A.M. Dirac, that led to Fermi Dirac statistics. He… …
44Nobel Prize winners by year 7 — ▪ Table Nobel Prize winners by year (1981–90) year category name country* achievement literary area 1981 chemistry Fukui Kenichi Japan orbital symmetry interpretation of chemical reactions chemistry Hoffmann, Roald U.S. orbital symmetry… …
45Chance (philosophy) — The word chance in philosophy means a complex of causes that produces an indeterministic process with indeterministic effects, therefore not necessary, not deterministic contingency. The ancient concept of chance as not existences of causes is… …
46Glossary of chemistry terms — This page is a glossary of chemistry terms. Chemistry has an extensive vocabulary and a significant amount of jargon. This is a list of chemical terms, including laboratory tools, glassware, and equipment. Chemistry itself is a physical science… …
47electron — /i lek tron/, n. 1. Also called negatron. Physics, Chem. an elementary particle that is a fundamental constituent of matter, having a negative charge of 1.602 × 10 19 coulombs, a mass of 9.108 × 10 31 kilograms, and spin of 1/2, and existing… …
48hadron — hadronic /ha dron ik/, adj. /had ron/, n. Physics. any elementary particle that is subject to the strong interaction. Hadrons are subdivided into baryons and mesons. Cf. quark. [1962; < Gk hadr(ós) thick, bulky + ON1] * * * Any of the subatomic… …
49meson — mesonic, adj. /mee zon, son, mez on, mes /, n. Physics. any hadron, or strongly interacting particle, other than a baryon. Mesons are bosons, having spins of 0, 1, 2, ..., and, unlike baryons, do not obey a conservation law. Cf. quark model.… …
50quark — /kwawrk, kwahrk/, n. Physics. any of the hypothetical particles with spin 1/2, baryon number 1/3, and electric charge 1/3 or 2/3 that, together with their antiparticles, are believed to constitute all the elementary particles classed as baryons… …
