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physical pharmaceutics pharmacy surface tension pharmaceutics detergency emulsification micelization properties of surfactants methods of determination of surfactants hlb classification of surfactants mechanism of surfactants structure surfactants adsorption at liquid interface spreading coefficient physical pharmacy unit-i solubility stability of pharmaceuticals drug stability molecularity of reaction order of reaction rate law rate of reaction chemical kinetics micromeritics b.pharm & isotonic solutions buffers ph states of matter and its properties states of matter protein bindings complexation adsorption at solid interface factors affecting solubilization solubilization