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LIME (O. Eng. lim, Lat. limes, mud, f...

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Originally appearing in Volume V16, Page 693 of the 1911 Encyclopedia Britannica.
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LIME (O. Eng. lim, See also:Lat. limes, mud, from linere, to smear)  , the name given to a viscous exudation of the See also:holly-See also:tree, used for snaring birds and known as " See also:bird-See also:lime." In See also:chemistry, it is the popular name of See also:calcium See also:oxide, CaO, a substance employed in very See also:early times as a component of mortars and cementing materials . It is prepared by the burning of See also:limestone (a See also:process described by Dioscorides and See also:Pliny) in kilns similar to those described under See also:CEMENT . The value and subsequent treatment of the product depend on the purity of the limestone; a pure See also:stone yields a " See also:fat " lime which readily slakes; an impure stone, especially if See also:magnesia be See also:present, yields an almost unslakable " poor " lime . See CEMENT, See also:CONCRETE and See also:MORTAR, for details . Pure calcium oxide " See also:quick-lime," obtained by See also:heating the pure carbonate, is a See also:white amorphous substance, which can be readily melted and boiled in the electric See also:furnace, cubic and acicular crystals being deposited on cooling the vapour . It combines with See also:water, evolving much See also:heat and crumbling to pieces; this operation is termed " slaking " and the resulting product " slaked lime "; it is chemically See also:equivalent to the See also:conversion of the oxide into See also:hydrate . A See also:solution of the hydrate in water, known as lime-water, has a weakly alkaline reaction; it is employed in the detection of carbonic See also:acid . " See also:Milk of lime " consists of a cream of the hydrate and water . Dry lime has no See also:action upon See also:chlorine, See also:carbon dioxide and See also:sulphur dioxide, although in the presence of water See also:combination ensues . In See also:medicine lime-water, applied externally, is an astringent and desiccative, and it enters into the preparation of linamentum calcis and carron oil which are employed to heal See also:burns, See also:eczema, &c . Applied internally, lime-water is an antacid; it prevents the curdling of milk in large lumps (hence its See also:prescription for infants); it also acts as a gastric sedative . Calcium phosphate is much employed in treating See also:rickets, and calcium chloride in haemoptysis and haemophylia .

It is an antidote for See also:

mineral and oxalic acid poisoning .

End of Article: LIME (O. Eng. lim, Lat. limes, mud, from linere, to smear)
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