Low Viscosity Fluids: 3 Interesting Facts To Know


The fluids which have low internal momentum resistance and do not resist deformation are called low viscosity fluids.

Low viscosity fluids are those whose viscous forces are much low or negligible compared to other fluids; also, the molecular formation makes its friction little or almost frictionless, causing the movements of fluids too fast.

An Introduction to Low Viscosity Fluids

Water being the basic necessity of our daily life, is used by us for multipurpose from drinking for clenching our thirst to bathing, cleaning, cooking and other daily activities. Similarly, we use fluid like honey in our regular or monthly diet plan because of the benefits we get from multi-nutrients present in it.

The most basic thing you must have noticed about these fluids would have been the difference in their speeds. The question, why water flows so fast while the speed of flow of honey is too slow as compared to water must have aroused in your mind.

The observation in the first situation where the main subject is water arises as the low inner resistance of water to remain in motion led to its momentum transfer very easily, inflicting it to shear it without any difficulty and the quick flow of its molecules described as low viscosity.

On the other hand, honey is a dense, dark-coloured, and semi-fluid substance with a very high internal resistance to flow, barring the momentum transfer causing it to flow sluggishly and resist deformation described as having high viscosity.

Let us now take another instance to make it more suitable to acknowledge. Take a bottle filled with milk and then pour it into another container. You will observe that the speed of milk that is flowing out of that bottle is too fast, and it barely settles on the surface of the bottle or the surface of the neck of the bottle. You will also observe that the contact between air and milk is for a concise duration.

Now, take another similar bottle filled with glycerine this time and pour it into another container. You will observe that speed of glycerine coming out of the container is too slow compared to the speed of flow of milk coming out of the bottle. Also, a good amount of glycerine settles on the surface of the bottle while pouring out. You will also observe that the contact timing between the air and glycerine is too long when compared to that of milk and air.

In the case of milk, after coming out of the bottle, it(milk) directly takes the shape of the container while on the other hand glycerine barely takes shape, and that too after a very long duration. This clearly shows that the viscous property which helps in resisting the internal momentum in glycerine is very high, while in milk, it is very less as compared to each other.

From the above instances, we can give a subsequent declaration about “Low Viscosity Fluids”:

“Fluids having low internal resistance due to their weak intermolecular forces resulting in easy transfer of momentum causing it to shear easily and making its molecule flow quickly described as Low Viscosity Fluids.”

Read more about : High Viscosity Liquids: Exhaustive Examples With Explanation

Different ways to determine the viscosity

The viscous property or viscosity is one of the properties of fluid that can be determined by using distinctive approaches and various methods. Whether a fluid is more viscous or its viscous property is less compared to others is being kept on record by these approaches. These types of approaches can easily be done by oneself or by using a standard measuring device which is basically made for measuring viscosity, i.e., a viscometer.

Method – 1 (Done By Oneself)

As observed and known by everyone, the duration a fluid takes to flow differs to some or a large extent. For example, if we pour out milk from one vessel to another, it will be transferred to another vessel acquiring the shape of that vessel and that too in a short period.

Now, let us do the same thing just by replacing milk with tomato sauce. The total time taken to be transferred from one vessel to another by tomato sauce, compared to the total time taken by the milk, will be a lot more. Moreover, if you can observe that the interface between milk and air when compared to that of tomato sauce and air takes very little time to settle. This experiment done by oneself clearly shows how one can determine which fluid is low viscous and to which fluid.

Method – 2 ( By Using Viscometer)

Since the past times, various kinds of methods have been adopted to determine the viscosity of a fluid. Also, many different kinds of viscometers ( a device used to measure the viscosity of fluid) have been developed for measurement. Also, among them, many are still in use till present. In general, the history of viscometry is very ancient and too vast for anyone to explore and acknowledge. The same is for viscometer, which is still being technically developed and is too vast to discuss after its invention in the past.

Now, we know that the inter-particle forces, which include the molecular attraction within the solution and the friction due to momentum resistance, determine the viscous property of a fluid.  The analysis of base principles on which viscometers works to determine the viscosity is categorised into two different forms:

ν=μ/ρ

μ=τ/γ

As we have already acknowledged about low viscosity fluids. Let us now move a step further and get to know some examples of low viscosity fluids.

Some Examples of Low Viscosity Fluids

Low Viscosity Fluids
“Glass of Milk” by Push Doctor is licensed under CC BY 2.0
“step 5” by Robert Couse-Baker is licensed under CC BY 2.0

Recent Posts