You might have also noticed that in this case I have been applying and measuring force to make the fluid flow. On the other hand, if you have honey inside the syringe, you better have a prety sturdy syringe and some mechanical system to help you apply enough force. You can probably push the fluid out using your fingers. Imagine that you have a very low viscosity fluid (water) inside a syringe. (Speaking of food, what's on the viscosity menu? Read more about food viscosity!)īack to the subject, another way to think about it is using a piston or syringe type of setup. In this example, the applied force is gravity. That's what we refer to as a measurement of kinematic viscosity or how fast does a fluid flow for a given force applied to it. You might have notice that I have been talking about time when trying to establish which of those two fluids is more viscous. On the other hand, a high viscosity fluid like honey would take minutes to pour out and the interface between honey and air would take just as long to settle. Water will pour out of a glass in a fraction of a second and will take the shape of the receiving container in just as short of a time. ![]() You can think in terms of different fluids taking different times to, for example, pour out of a cup. ( Watch our webinar on the different types of viscosity!) Viscosity can be measured using various methods from do-it-yourself methods to viscometers that are available in the market. Just like in the case of friction between moving solids, viscosity will determine the energy required to make a fluid flow. This can be also understood as friction between the molecules in the fluid. ![]() However, this definition can be confusing when we are looking at fluids with different densities.Īt a molecular level, viscosity is a result the interaction between the different molecules in a fluid. You can think of water (low viscosity) and honey (high viscosity). Viscosity is often referred to as the thickness of a fluid. Viscosity is defined as the resistance to flow!
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