Coin and Water Drop Experiment - Surface Tension Explained

Hey guys, welcome back
Today we will be doing an experiment of coin and water drops.
The setup for the experiment is very easy. You take a coin & water in a syringe, ink filler or dropper.
Now start dropping water on the coin drop by drop.
We will see how much water can stand on the surface of a coin.
If you have any guesses, just keep it to yourself and let’s see at the end of this video…
This works in the principle of surface tension and cohesive force.

See, the water is taking a convex shape, the water drops also take a spherical shape.
This is due to a concept of surface tension.
Surface Tension is a property of liquids which acts on the Surface of it.
The water molecules are attached to each other which is called the cohesive forces and it resists an external force.
Let me explain it now for you, due to cohesive forces in water, every water molecules are pulled from every side. But what will happen to the water molecules on it’s surface? They are pulled by water molecules on one side and air molecules on the other side.
The attraction between water molecules is stronger than the attraction between water and air molecules. Hence, they get pulled inwards into the water. This creates an internal pressure and makes liquids to contract to a minimum area. Which is why water is trying to take this shape.
I hope you will try this yourself at home.
Please try this and write your experience in the comment down below.
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