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Section A A index 131-139 of 917 terms Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 Next acoustic velocimeter—An instrument for making direct measurements of the speed of sound in oceans and lakes. acoustic wave—(Or sound wave.) From its Greek origin, akoustikus, meaning related to hearing, acoustic ought to be restricted to sound audible to humans (or animals). Although this is often the sense in which it used, the term is also used to embrace sound of all frequencies. acre-foot—The volume of water represented by a depth of 1 ft over an area of 1 acre. The area of 1 acre is equal to 43 560 ft2, 1 acre-foot is equal to 43 560 ft3. acrolein—Unsaturated aldehyde, formula CH2CHCHO, formed as an oxidation product of butadiene, which is a common emission from automobiles. actinic balance—Same as bolometer. actinic flux—The spherically integrated radiation flux in the earth's atmosphere that originates from the sun, including the direct beam and any scattered components. This radiation is responsible for initiating the chemistry of the atmosphere. Compare radiance, irradiance. actinic rays—See actinic. actinic—Pertaining to electromagnetic radiation capable of initiating photochemical reactions, as in photography or the fading of pigments. Because of the particularly strong action of ultraviolet radiation on photochemical processes, the term has come to be almost synonymous with ultraviolet, as in “actinic rays.” actinogram—The record of an actinograph. actinograph—A recording actinometer. See Robitzsch actinograph. Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 Next