![]() We know that the formula for the viscosity is: The kinematic viscosity carries the three types of measuring units, let’s discuss these in a tabular form: In CGS or Centi-gram-second, the unit of the density is gcm⁻³. In MKS (Meter-kilogram-second), the unit of the density is kgm⁻³. Absolute viscosity is a parameter for measuring the internal resistance in the fluid. The unit employed for measuring the dynamic viscosity of a fluid is Pa.s (where ‘Pa’ stands for Pascal and ‘s’ stands for seconds). The unit of the kinematic viscosity is m²/s.ĭynamic viscosity = It is a force required to overcome the internal friction of any fluid. According to the equation of kinematic viscosity, the equation says the following:Ī kinematic viscosity represents the dynamic viscosity of a fluid per unit density. The above scenario clearly explains the two following parameters:Ī subject like Physics does not rely on theoretical knowledge only it also focuses on mathematical equations, so let’s discuss the density viscosity equation. So, what we notice is, the interatomic particles make some distance under the effect of rising temperature and also the friction between the layers of honey while pouring it into another bowl reduces. When the same is kept under the sun or when the jar of honey is kept under the vessel containing hot water, the honey melts. We don’t find the direct viscosity and density relation however, both of these are affected by temperature.Īs we can see, honey during winters has high density because it solidifies and in a solid-state, the interatomic particles are attached. The formula for the conversion from kinematic to dynamic and from dynamic to kinematic is:įor a given sample, dynamic viscosity will always be the higher number with a density greater than one. With density, the conversion between a kinematic and a dynamic viscosity can be carried out. The unit of measure of kinematic viscosity is Centistokes (cSt).Ī primary difference between the dynamic and kinematic viscosity measurements is density. The time is converted directly to kinematic viscosity with the help of a calibration constant provided for the specific tube. The most common method to measure the kinetic viscosity is by determining the time it takes a fluid to flow through a capillary tube. There are few methods to find the kinematic viscosity of a fluid. The unit of measure for the dynamic viscosity is denoted as Centipoise (cP). The viscometer determines the variation in the viscosity of the sample as the speed, sometimes referred to as shear rate. For instance, some non-Newtonian liquids increase in viscosity with an increase in applied force, whereas other non-Newtonian liquids show a decrease in viscosity with an increase in applied force.Īs the probe moves in the liquid, the rotational viscometer adjusts its turning speed. When non-Newtonian liquids are exposed to different conditions, they change viscosity. The rotational viscometer is especially useful in measuring non-Newtonian liquids. Viscosity is evaluated by measuring the force or torque needed to rotate the probe. ![]() In a liquid sample, this instrument rotates a probe. The key differences between viscosity and density are given in the following table.Ī rotational viscometer is one of the more popular types of instruments, and it is used to measure dynamic viscosity. I believe that through this example, you were able to understand what viscosity density is. Not only the liquid does, but air also has a viscosity that varies with temperature. So, the friction caused is called viscosity. Well, it is because there is friction between the two layers and this friction hampers the fast flow of fluid, i.e., oil and the pickle pieces. You might have wondered why this happened? Ummm, quite yes! Let’s suppose that you have a big jar of pickles and want to transfer some pieces of it into the small jar, you would notice that the layers of oil come along with each piece and it takes a bit of time to reach another jar. Now, let’s understand an example of a pickle. So, when we differentiate in terms of the distance each particle bears from another particle in a fluid, then it is density. At the microscopic level, honey has tightly bound particles, whereas water has particles that are far apart. Consider fluid A as honey and another as water. Now, let’s take a look at another example. Now, let’s understand how viscosity is related to density. In the above example, we took two fluids viz: hair oil and milk. So, why do we consider these terms as different when both of these carry the same meaning? Here, we would notice that the milk takes less time as compared to the hair oil, do you know why? It’s because the hair oil is more viscous or it is denser than the milk. ![]() ![]() Now, let’s compare the two by pouring them into another container by switching on the timer. One is hair oil and another is milk, each of these is filled in one container. ![]()
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