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| the attractive effect of matter on other matter; the region surrounding an astronomical body in which the force of gravitation is strong |
| the amount of a given fissionable material necessary to sustain a chain reaction at a constant rate |
| kaon (kā'ŏn') Pronunciation Key
Any of three unstable mesons, one having charge +1 and a mass of 966 electron masses, and two being electrically neutral, with a mass 974 electron masses. Their half-life is approximately 10-8 seconds, and they decay through the weak force. Their decay patterns suggest that CP invariance may be violated. Also called K-meson, K particle. See Table at subatomic particle. |