viscous flow, occurs in accordance with Newtons law, More or less similarI will try to put brief concepts of viscosity in terms of pharmaceutics which is somewhat another branch of chemistry, where it is very much applicable in drug design. Perhaps you meant your title to read: “ Viscosity: The molecular perspective” or something like that )$\endgroup$ For exact definitions of various viscosities open IUPAC Gold Book and search for “viscosity” you will see it’s the same physical terms.$\endgroup$at 15:28 3$\begingroup$Viscosity is defined in chemistry and physics pretty much equally.This would give rise to the resistance to shear.$\endgroup$at 15:27 2$\begingroup$There are intermolecular forces but also molecules are not point masses so they don’t just slide past each other smoothly.When molecules are farther apart then viscosity is lower than when molecules are closer.Ĭould you tell me if my mature concept about viscosity is on the right track or far too off? Could you also define viscosity in terms of chemistry? We could say that it is a measure of its resistance to gradual deformation by shear stress or tensile stress.īut what does it mean in the chemistry world?I believe it is related to the distance between molecules in a solution. In physics, viscosity is the force applied in a unit area times time or basically Pascal times second. Drop a marble into the liquid and start a stopwatch, then record the time it takes for the ball to drop between the marks.Īlso Check: What Is Expanded Notation In Math What Is Viscosity In Terms Of Chemistry
To measure viscosity, fill a graduated cylinder with the liquid to be measured and mark the liquids positions at the top and bottom of the cylinder. Some people also know it with the adjectivethickness, although its real name is viscosity. Viscosity is a measure of resistance to deformations caused by tensile stresses or shear stresses. The 10 Most Known Viscosity Examples Some Examples of viscosity Or viscous substances are: honey, oil, toothpaste and some chemical elements such as mercury. The term viscosity derives from the typically thick flowing berry juice of the mistletoe plant species. A higher viscosity indicates that the medium is thick flowing a lower viscosity that it is thin flowing. What does viscosity actually mean? Viscosity is a measure of a mediums internal resistance to flow. The result is typically expressed in centipoise, which is the equivalent of 1 mPa s. The formula for measuring viscosity is fairly simple: viscosity = shear stress / shear rate. Viscosity is the measure of a substances resistance to motion under an applied force. What is viscosity, and how is It measured?
Honey, syrup, motor oil, and other liquids that do not flow freely, like those shown in Figure 1, have higher viscosities. Water, gasoline, and other liquids that flow freely have a low viscosity. The viscosity of a liquid is a measure of its resistance to flow. The unit of viscosity, accordingly, is newton-second per square metre, which is usually expressed as pascal-second in SI units. The dimensions of dynamic viscosity are force à time à It controls the liquid flow in such processes as spraying, injection molding, and surface coating. Viscosity is a major factor in determining the forces that must be overcome when fluids are used in lubrication and transported in pipelines. Because part of a fluid that is forced to move carries along to some extent adjacent parts, viscosity may be thought of as internal friction between the molecules such friction opposes the development of velocity differences within a fluid. Molasses, for example, has a greater viscosity than water. The reciprocal of the viscosity is called the fluidity, a measure of the ease of flow. Viscosity, resistance of a fluid to a change in shape, or movement of neighbouring portions relative to one another. Thus, upon heating, liquids flow more easily, whereas gases flow more sluggishly. The viscosity of liquids decreases rapidly with an increase in temperature, and the viscosity of gases increases with an increase in temperature.
Viscosity of Fluids & Velocity Gradient – Fluid Mechanics, Physics Problems
0 kommentar(er)
