![]() ![]() The word viscous comes from the Latin root viscum, meaning sticky. If the lava is thin (low viscosity), then it just flows out like water. This is because the lava has a hard time getting out and may burst out when it can. When the lava comes out very thickly ( viscous), there is more chance that it will erupt violently. Viscosity is used as a way to predict when volcanoes erupt. There are two types of viscosity: dynamic viscosity, measured in pascal seconds, and kinematic viscosity, measured in metres per second squared. Syrup would reach the bottom very slowly, and water would be much quicker. A way to test for viscosity is the speed at which the substance runs down a slope. Syrup and tar, on the other hand, have a high viscosity, as they are "thick". In a simple example, water has a low viscosity, as it is "thin". Viscosity is a physical property of fluids. Now let’s learn about them in detail.Illustration of viscosity the violet fluid at the bottom has a higher viscosity than the clear one above So on this basis we have two types of liquid that are, The viscosity of any liquid is directly influenced by the change in pressure and temperature in the liquid. The table given below lists some fluids and their coefficient of viscosity at different temperatures:
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