S.I.F. Study is fun

Surface Tension Objective To determine the surface tension of a liquid by capillary rise method. Theory How do you define surface tension? Surface tension is the property of a liquid, by virtue of which its free surface at rest behaves like an elastic skin or a stretched rubber membrane, with a tendency to contract so as to occupy minimum surface area. This property is caused by cohesion of molecules and is responsible for much of the behaviors of liquids. The property of surface tension is revealed, for example, by the ability of some objects to float on the surface of water, even though they are denser than water.  Surface tension is also seen in the ability of some insects, such as water striders, and even reptiles like basilisk, to run on the water’s surface.            The Theory Behind Surface Tension Surface tension has been well- explained by the molecular theory of matter. According to this theory, cohesive forces among liquid molecules are responsible

Viscocity of a Liquid \ Stokes Law Objective To determine the coefficient of viscosity of a given viscous liquid by measuring terminal velocity of a given spherical body. Theory How do you define viscosity?  Viscosity is the property of a fluid by virtue of which an internal resistance comes into play when the liquid is in motion, and opposes the relative motion between its different layers. Thus, it is the resistance of a fluid to flow. When liquid flows over flat surface, a backward viscous force acts tangentially to every layer. This force depends upon the area of the layer, velocity of the layer, and the distance of the layer from the surface.                                                                                                                                        Where η is the  coefficient of viscosity  of the liquid.   Stoke’s Law Stoke’s law was established by an English scientist Sir George G Stokes (1819-1903).  When a spherical body moves