Pharmacy Study Material

Free pharmacy material Surface Tension Determination INTRODUCTION Surface tension is a phenomenon in which the surface of the liquid is in contact with the gas. Surface tension is defined as the force acting at right angles to a line of unit length present in the surface. This is denoted by ‘γ’. W = F × d where W = work; F = force; d = distance. Therefore, (γ) Gamma = F / d The SI units for the surface tension are newton/meter or dyne/cm. At a liquid surface, the molecule is not completely surrounded by other molecules. Surface tension phenomenon The surface tension of a liquid is the energy required to increase the surface area which increases the stability of the solution and increases the solubility rate. Examples of surface tension are drops of water, insects walking on water and paper clips floating on water. An important measure for the characterization of surfactants which reduces surface tension is the critical micelle co...