On increasing pressure, the viscosity of liquid molecules increases due to an increase in the resistance to the flow caused by increased interaction between the molecules whereas, the viscosity of gas molecules decreases with increasing pressure. Pressure and temperature are the major factors that affect viscosity. ![]() The SI unit of Viscosity is Pascal-second(Pas) and the CGS unit is Poise(P).ġ Pa.s=10 poise Factors affecting viscosity So, the definition of viscosity would be a fluid’s resistance to flow. Viscosity can be simply explained as the resistance caused due to friction between adjacent layers of a liquid that are in relative motion. Viscosity explainedĪs you have seen, more viscous fluid like honey tends to flow slowly, and less viscous fluid, for example, water, flows freely. So, we can say that honey is more viscous than water. This thickness or friction of liquids is referred to as the viscosity of a liquid. This is because of an internal resistance between the molecules that prevent a liquid from moving. Did you notice any difference in the time taken by each liquid to reach the respective tumblers? Did honey take more time to reach the tumbler than water or vice versa? ![]() Have you ever wondered why honey is thicker than water? Or why do different liquids have different consistency?įor example, just pour some water and honey into different tumblers simultaneously. Viscosity-Understanding the science of thickness of liquids.
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