- Secchi disk
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n.a circular, white or colored disk lowered into a body of water to estimate the clarity of the water by measuring the depth at which it disappears
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Universalium. 2010.
Secchi disk
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Secchi disk — or Secchi disc [sek′ē] n. a circular, white or colored disk lowered into a body of water to estimate the clarity of the water by measuring the depth at which it disappears … English World dictionary
Secchi disk — The Secchi disk, created in 1865 by Pietro Angelo Secchi, is a circular disk used to measure water transparency in oceans and lakes. The disc is mounted on a pole or line, and lowered slowly down in the water. The depth at which the pattern on… … Wikipedia
Secchi — may refer to:* Angelo Secchi, an Italian astronomer * Secchi (lunar crater) * Secchi (crater on Mars) * Secchi disk, an oceanographic/limnological instrument * SECCHI (Sun Earth Connection Coronal and Heliospheric Investigation), an instrument… … Wikipedia
Secchi disc — /ˈsɛki dɪsk/ (say sekee disk) noun a disc used to gauge water clarity by measuring the depth at which it is no longer visible from the surface. {created in 1865 by Pietro Angelo Secchi, Italian astronomer, 1818–78} …
Angelo Secchi — Infobox Scientist name = Angelo Secchi box width = image width =150px caption = Angelo Secchi birth date = 29 June 1818 birth place = Reggio Emilia death date = 26 February 1878 death place = residence = Rome citizenship = nationality = Italian… … Wikipedia
Secchidisk — Secchi disk n. A disk, divided into black and white quarters, used to gauge water clarity by measuring the depth at which it is no longer visible from the surface. [After Pietro AngeloSecchi (1818 1878), Italian astronomer hired to test such a… … Universalium
Turbidity — standards of 5, 50, and 500 NTU Turbidity is the cloudiness or haziness of a fluid caused by individual particles (suspended solids) that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key… … Wikipedia
Trophic state index — The quantities of nitrogen, phosphorus, and other biologically useful nutrients are the primary determinants of a body of water s trophic state index (TSI). Nutrients such as nitrogen and phosphorus tend to be limiting resources in standing water … Wikipedia
Lake — For other uses, see Lake (disambiguation). Oeschinen Lake in the Swiss Alps A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the… … Wikipedia
undersea exploration — Introduction the investigation and description of the ocean waters and the seafloor and of the Earth beneath. Primary objectives and accomplishments Included in the scope of undersea exploration are the physical and chemical… … Universalium
