What is Surface Tension? (With 5 examples)

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Surface tension is the attractive force that exists between two liquids on their surfaces when they are in contact. Surface tension causes liquids to bead, spread out and form a meniscus at a liquid-liquid interface. The surface of one droplet will be attracted to the other due to its surface area being greater than or equal to the combined areas of all other droplets within some distance from it.

Surface tension is the force that resists the flow of a liquid on the surface of a liquid. Surface tension is what causes water to bead up and roll off the top of a glass or any other object. In everyday life, examples of surface tension include raindrops falling from the sky, bubbles rising in hot liquids like coffee, and soap foam.

What is Surface Tension? (With 5 examples)

First, let me describe surface tension for you. It is a liquid characteristic that causes the surface of a liquid to seem like an elastic membrane that has been stretched out. This is a phenomena that may be seen in microscopic liquid droplets or soap bubbles of any form that is practically spherical. Water tension is another name for it. Some insects are able to stand on the surface of water because to this feature possessed by liquids. If you want to observe how surface tension works, try putting a razor blade on top of water in a horizontal direction. You’ll notice the razor blade floating on the water’s surface. Well, let me tell you that the razor blade is not at all floatable; in fact, if you attempt to put it into the water with even a little amount of power, it will sink. I hope you understand what surface tension is now.


Surface tension is a phenomena that is primarily caused by the attraction forces between liquid particles in the liquid and the solid, liquid, or gas in contact with the liquid. The molecules in a water droplet indeed attract one other, but only with a little amount of force. Surface tension in water is caused by the molecules existing within the water droplet being drawn in all directions with equal force by the molecules that surround it. The energy necessary to cause this kind of surface tension event may readily be compared to the energy or labor required to remove a layer of molecules from a surface with a unit area.

The unit for surface tension is joules per unit area, which is also the unit for energy. At a temperature of 20 degrees Celsius, the water surface tension is 0.07275 joule per square meter. When we compare organic liquids such as alcohols and benzene, we can see that they have lower surface tension. When we look at the surface tension of mercury, we can see that it is substantially higher. As the temperature rises, the total force of attraction between molecules decreases, resulting in a drop in surface tension.

Examples of surface tension –

Floating a Needle is the first step.

If you carefully set a needle on the surface of water, you will see that it does not sink. Until the surface tension is broken, the needle will not sink.

2. Using Cold Water to Wash the Clothes

The fundamental rationale for using hot water to wash clothing is because the surface tension will be reduced, and it will be a considerably better wetting agent. If the detergent lowers the surface tension, however, heating may not be required.

3. Take a Water Walk

As I previously said, certain insects are able to stand on the water’s surface.

4. Water-Floating Razor Blade

You may see a razor blade floating on the surface of water if you place it on top of water in a horizontal orientation. Well, let me tell you that the razor blade is not at all floatable; in fact, if you attempt to put it into the water with even a little amount of power, it will sink.

Water Strider, No. 5

It’s a kind of bug that can float on water. Because the water is still there in most lakes and ponds, you’ll see one.


So that was the end of the article on water surface tension.

I hope you found this essay useful. If you have any more questions or recommendations, please leave them in the comments section below. Also, if you have any other examples of surface tension that you’d want to share with us, please do so in the comments section below.

Surface tension is a property of liquids that causes them to resist spreading out on the surface. This is important because it prevents droplets from forming. Surface tension is measured by the contact angle, which is defined as the angle between the liquid and solid surfaces. Reference: why is surface tension important.

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