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Usually, this means if you want to get a material flowing, you'll have to heat it up, and if you want it to stop flowing, you'll have to cool it down. And the colder a liquid is, the more viscous it'll be. In general, the hotter a liquid is, the less viscous it'll be. But another important factor is temperature. Obviously, the properties of the material itself will affect its viscosity. So with the hair gel example, it has high viscosity because it's very resistant to flow and has high internal friction.
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Viscosity measures a liquid's resistance to flow essentially, it's how much internal friction there is in it. That's the right idea, but let's delve a little bit deeper. At a basic level, you probably know it's how thick or thin a liquid is.
#Viscosity chemistry how to
We'll give you all the information you need to ensure better product viscosity.īefore we show you how to calculate viscosity, you'll have to first understand what it is. If you're wondering how to calculate viscosity so you can have better control over your materials, then keep reading. In order to keep your materials at the right viscosity, you'll need to make the right calculations and have control over the storage parameters, such as the temperature. This is because it has high viscosity.Īs you may guess, viscosity is highly important for a range of products without the right viscosity, you may get product waste. If we know the and values for a given polymer solution the intrinsic viscosity and molecular weight can be calculate using the above equation.When you get up in the morning and squeeze some hair gel into your hand, you may notice that no matter which way you turn your hand, the gel doesn't really go anywhere. Where is the intrinsic viscosity, is Molecular weight, and are constants for a particular polymer solvent system. The molecular weight of the polymer solution is very high so the viscosity of polymer solution is very high compared to that of pure solvent.įrom the Mark-Houwink equation the relationship among the molecular weight and viscosity are given below The molecular weight of the polymer is measured by using viscometer and the molecular weight obtained by this technique is called viscosity average molecular weight. The unknown composition can be determined by plotting a graph for the time of flow and compositions.
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In this method the flow times are measured for different known compositions and a graph is plot for time of flow and compositions. The time of flow of liquid depends on the viscosity and composition. Various mixtures of two non-interacting liquids viscosities will lie among the viscosities of those pure components. And η 1 is the coefficient of viscosity of water.įor a given liquid η has a specific value at the same temperature. Here t 1 and t 2 are the time of flow of the liquids and ρ 1 and ρ 2 are the respective densities. Then the coefficient of viscosity of liquid (η 2) is given by equation In this method viscosity of liquid is measured by comparing the flow times of two liquids of equal volumes using same viscometer.Ĭonsider two liquids are passing through a capillary of same viscometer. The Ostwald method is a simple method for the measurement of viscosity, in which viscosity of liquid is measured by comparing the viscosity of an unknown liquid with that of liquid whose viscosity is known. Many methods are available for measuring viscosity of polymer solution. It is due to the internal friction of molecules and mainly depends on the nature & temperature of the liquid. Viscosity is an internal property of a fluid that offers resistance to flow. Determine the viscosity average molecular weight of a polymer.Determine the absolute viscosity of Polymer solutions of different concentrations.