positive rays
71Cold fusion — This article is about the Fleischmann–Pons claims of nuclear fusion at room temperature. For the original use of the term cold fusion , see Muon catalyzed fusion. For all other definitions, see Cold fusion (disambiguation). Diagram of an open… …
72Lens (optics) — For other uses, see Lens. A lens. Lenses can be used to focus light. A lens is an optical device with perfect or approximate axial symmetry which tra …
73electromagnetism — /i lek troh mag ni tiz euhm/, n. 1. the phenomena associated with electric and magnetic fields and their interactions with each other and with electric charges and currents. 2. Also, electromagnetics. the science that deals with these phenomena.… …
74quantum mechanics — quantum mechanical, adj. Physics. a theory of the mechanics of atoms, molecules, and other physical systems that are subject to the uncertainty principle. Abbr.: QM Cf. nonrelativistic quantum mechanics, relativistic quantum mechanics. [1920 25]… …
75Angle — This article is about angles in geometry. For other uses, see Angle (disambiguation). Oblique angle redirects here. For the cinematographic technique, see Dutch angle. ∠, the angle symbol In geometry, an angle is the figure formed by two rays… …
76Food irradiation — The Radura logo, used to show a food has been treated with ionizing radiation. Food irradiation is the process of exposing food to ionizing radiation[1] to destroy microorganisms, bacteria, viruses, or ins …
77diagnosis — /duy euhg noh sis/, n., pl. diagnoses / seez/. 1. Med. a. the process of determining by examination the nature and circumstances of a diseased condition. b. the decision reached from such an examination. Abbr.: Dx 2. Biol. scientific… …
78sun — sunlike, adj. /sun/, n., v., sunned, sunning. n. 1. (often cap.) the star that is the central body of the solar system, around which the planets revolve and from which they receive light and heat: its mean distance from the earth is about 93… …
79J. J. Thomson — Infobox Scientist box width = 300px name = J. J. Thomson image size = 200px caption = Sir Joseph John Thomson (1856 1940). Portrait by Arthur Hacker. birth date = 18 December 1856 birth place = Cheetham Hill, Manchester, UK death date = Death… …
80antimatter — /an tee mat euhr, an tuy /, n. Physics. matter composed only of antiparticles, esp. antiprotons, antineutrons, and positrons. [1950 55; ANTI + MATTER] * * * Substance composed of elementary particles having the mass and electric charge of… …
