Wells's principles and applications of chemistry; . 16 PRINCIPLES OF CHEMISTRY. ?pjQ ^ -whicli supplies tho flame from a siirfaco often two or three inches below the pointof combustion. When one end of a sponge, or a lump ofsugar is brought into contact with water,the Uquid, by capillary attraction, will rise,or soak up above its level, into the interiorof the sponge, or sugar, until all its poresare 14. Affinity is tliat variety of molecular force or attrac-tion which unites atoms of unlike substances into com-pounds possessing new and distinct properties. Oxygen, for example, unites
Wells's principles and applications of chemistry; . 16 PRINCIPLES OF CHEMISTRY. ?pjQ ^ -whicli supplies tho flame from a siirfaco often two or three inches below the pointof combustion. When one end of a sponge, or a lump ofsugar is brought into contact with water,the Uquid, by capillary attraction, will rise,or soak up above its level, into the interiorof the sponge, or sugar, until all its poresare 14. Affinity is tliat variety of molecular force or attrac-tion which unites atoms of unlike substances into com-pounds possessing new and distinct properties. Oxygen, for example, unites with iron, and forms oxyd of iron, or iron-rust, a substance possessing different and distinct properties from either ironor oxgyen. In like manner, oxygen and hydrogen, two gases not to be dis-tinguished in appearance from common air, tmite to form water, a liquid. When the particles of different substances are united together by the forceof affinity, the compound formed possesses properties entirely different fromthat of its constituents, and in no respect resembles a mixture, which ismerely a mechanical union of bodies—as when salt is mixed with sand. Theforces of adhesion or capillary attraction may closely unite unlike particles ofmatter together, but they do not effect any change in the nature or propertiesof the particles acted upon. Affinity, on the contrar}^, entirely changes theproperties
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectchemistry, bookyear18
