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acre-foot: ac ft ≡ 1 ac x 1 ft = ... = 205.196 548 3 mg carat (metric) ct ≡ 200 mg ... 1 ⁄ 100 of the energy required to warm one gram of air-free water from 0 ...
As the name suggests, an acre-foot is defined as the volume of one acre of surface area to a depth of one foot. Since an acre is defined as a chain by a furlong (i.e. 66 ft × 660 ft or 20.12 m × 201.17 m), an acre-foot is 43,560 cubic feet (1,233.5 m 3). There has been two definitions of the acre-foot (differing by about 0.0006%), using ...
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acre-foot A customary unit of volume defined as the volume of one acre of surface area to a depth of one foot, commonly used in the United States about large-scale water or soil resources. One acre-foot is equal to 43,560 cubic feet (1,233 m 3). adjuvant A chemical compound added to a pesticide formulation to increase its efficacy or safety. [2]
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As an example, given a concentration of 260 mg/m 3 at sea level, calculate the equivalent concentration at an altitude of 1,800 meters: C a = 260 × 0.9877 18 = 208 mg/m 3 at 1,800 meters altitude Standard conditions for gas volumes
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Units for other physical quantities are derived from this set as needed. In English Engineering Units, the pound-mass and the pound-force are distinct base units, and Newton's Second Law of Motion takes the form = where is the acceleration in ft/s 2 and g c = 32.174 lb·ft/(lbf·s 2).