Both acts tangentially in the opposite direction of motion. Hence the coefficient of viscosity is a measure of the resistance of the fluid to deformation at a given rate due to internal friction.1 Definition of viscosity (Newton’s law of fluid friction) 2 Rotational viscometer. Viscosity can be conceptualized as quantifying the internal frictional force that arises between adjacent layers of fluid that are in relative motion. The intrinsic viscosity is used to classify polymers and. Intrinsic viscosity determination is used in the field of polymer chemistry, a chemistry subdiscipline which deals with the synthesis of polymers as well as the analysis of a polymer’s structure and properties. The force of friction f between two layers each having area A sq cm, separated by a distance dx cm, and having a velocity difference of dv cm/sec, is given by: f A ( dv / dx ) f A ( dv/dx) where is a constant known as the. means a noxious liquid substance in Category X or Y with a viscosity equal to or greater than 50 mPa.s at the unloading. Figure 1: A polymer is composed of identical sub-units called monomers. Let us look now at the similarities of Solid Friction and Viscosity. Viscometry is the experimental determination of the viscosity of liquids and gases with so-called viscometers. Viscosity is the force of friction which one part of the liquid offers to another part of the liquid. Viscosity does not depend on the normal reaction between the two layers in contact but Solid Friction does.Viscosity is proportional to the surface area of contact of liquid layers whereas Solid friction is independent of the area of surfaces in contact.Viscous force is directly proportional to the relative velocity of the layers of liquid under consideration whereas Solid Friction is independent of the relative velocity of bodies in contact.Let us look at the differences or dissimilarities of Solid Friction and Viscosity. It is the measure of fluid’s resistance to flow. It is the internal friction of fluid flow. Viscosity of liquids in chemistry is the resistance to flow exhibited by fluids (liquids or gases) like glycerol, ester, oils, water, alcohol, and ether. Static, Sliding and Rolling Frictions are the examples of Solid Frictions.Īlso Read: Chapter 12 Friction Class 8 Notes Pdf Viscosity Definition The friction that acts between the surfaces of solid surfaces. There are basically four types of frictions.
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