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Kelvin equation; area tension and surface Strength, wetting and phone angle, interfacial stress and capillary action. I need to begin my preparing for IAS now. I'm 11std now. Sir be sure to suggest me what I should do . Sir,Iam from manipur Iam kh sahidur rahaman I've providing 6sem for bsc this yr.I need to arrange for upsc prelim exam remember