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Ebony is a dense black/brown hardwood, coming from several species in the genus Diospyros, which also includes the persimmon tree. A few Diospyros species, such as macassar and mun ebony, are dense enough to sink in water. Ebony is finely textured and has a mirror finish when polished, making it valuable as an ornamental wood. [1]
Buoyancy (/ ˈ b ɔɪ ən s i, ˈ b uː j ən s i /), [1] [2] or upthrust is a net upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid.
Neutral buoyancy occurs when an object's average density is equal to the density of the fluid in which it is immersed, resulting in the buoyant force balancing the force of gravity that would otherwise cause the object to sink (if the body's density is greater than the density of the fluid in which it is immersed) or rise (if it is less).
A floating object's weight F p and its buoyancy F a (F b in the text of the image) must be equal in size.. Consider a cuboid immersed in a fluid, its top and bottom faces orthogonal to the direction of gravity (assumed constant across the cube's stretch).
Diospyros marmorata R.Parker – marblewood ebony, "marblewood" Diospyros melanoxylon Roxb. – Coromandel ebony, East Indian ebony var. tupru (Buch.-Ham.) V.Singh; Diospyros mespiliformis Hochst. ex A.DC. – jackalberry, "African ebony" Diospyros mindanaensis Merr. Diospyros montana Roxb. Diospyros mun A.Chev. ex Lecomte – mun ebony ...
In fluid dynamics, the Boussinesq approximation (pronounced, named for Joseph Valentin Boussinesq) is used in the field of buoyancy-driven flow (also known as natural convection).
Ebony is a dense black wood taken from several species in the genus Diospyros, including Diospyros ebenum (Ceylon ebony, Indian ebony), Diospyros crassiflora (West African ebony, Benin ebony), and Diospyros celebica (Makassar ebony). Diospyros tesselaria (Mauritius ebony) was heavily exploited by the Dutch in the 17th century.