The viscosity of water is 0.001 Pa s, that of motor oil is 1, and that of air is 0.000019 Pa s. Furthermore, the more viscous a fluid is, the more resistance shall it offer to any object flowing or moving inside it. From the formula mentioned above, it is quite evident that if the velocity of the sphere increases, the viscosity will be more. We measure viscosity in Pascal seconds that is Pa s. We can, in turn, calculate v as the distance traveled by the sphere per unit time. Δρ = difference in the density of the fluid and the sphere tested Η = viscosity (represented by the symbol η or “eta”) If we drop a sphere into a fluid, we can calculate the viscosity using the formula specified below: The viscosity of a fluid is measured in terms of the ratio of its shearing stress (if the direction of external force on an object is parallel to the plane of an object, then the deformation will be along that plane, and the stress on the object will be shear stress) to its velocity gradient (the difference between the adjacent layers of a fluid). For instance - the viscosity of syrup is higher than that of water. So, we can say that the viscosity of a fluid refers to the measure of its resistance to gradual deformation at a given rate. In the example we discussed earlier concerning honey and water, we can say that honey is thicker than water due to which it is more viscous than water as well. To be specific, viscosity defines a fluid's resistance to flow. The term 'Viscosity' in physics refers to the measure of the resistance of a fluid to gradual deformation by tensile stress (the force acting along the axis of force, which is responsible for the stretching or elongation of material) or shear stress (the external force on an object or surface area parallel to the plane or slope in which the object lies). Do you know the difference between both cases? The answer lies in the property of fluids, known as viscosity. In this particular scenario, the honey poured will take its own time running down the hair and face of that person. Now, let us consider another situation in which you pour 1000 ml of honey on a person's head. The effect of viscosity is important in a variety of disciplines, for example, in the study of fluids and gasses, as it governs their behavior.ĭo you know what will happen if you pour 1000 ml of water on a person's head? The water flows through the person's hair and then over the face. If the flow is a stream of uniform velocity, there is zero viscosity if, on the other hand, the velocity is turbulent and chaotic, there will be some viscosity. If the fluid is caused to flow smoothly and regularly, there will be no viscosity. More simply, it is the resistance to a simple flow. In physics, Viscosity is defined as the measure of the resistance of a fluid to flow. The measure of a fluid's resistance to flow is known as viscosity. The viscosity of water decreases smoothly from the freezing point while the density remains essentially constant except for the small maximum in density near 4☌. In cgs units the unit is called the centistoke. The kinematic viscosity is the dynamic viscosity divided by the density of the fluid. The unit centiPoise = 0.001 Pa s and is is sometimes written mPa s. These viscosities are at 20☌ except for the blood and blood plasma which are at body temperature, 37☌, and for steam which is at 100☌. The Poise is used in the table because of its more common usage. More commonly used is the dyne sec/cm 2 which is called Poise. Viscosity has the SI units Pascal seconds (Pa s) which is called the Poiseuille. Viscosity of Liquids and Gases Viscosity of Liquids and Gases Liquids
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |