Why does a water droplet always take a round shape?
Since the area of a sphere is smaller than any other shape, thus liquid take a round or spherical shape to form droplets when dropped on surface. — Sheshmani, Mumbai
Why do water drops spread out on a flat surface?
On a perfectly flat and perfectly smooth surface, the water attempts to spread out because gravity (primarily) is pulling down on the water causing the water droplet to spread out. However, as the water tries to spread out, surface tension resists the stretching of the surface of the drop.
Why does a water drop look like a ball?
The drop takes this shape because water molecules tend to stick to each other. So, when not confined by a container, and with nothing around it to distort its shape, a very tiny water drop is perfectly round like a ball because the water molecules are pulling inward toward each other.
Why are falling drops of water always spherical?
Falling drop of a liquid is always spherical in shape due to surface tension. The inward forces on the surface molecules of the liquid droplet tend to cause the surface to volume ratio as small as possible. Since surface to volume ratio is minimum for the spherical shape that’s why falling drop of a liquid is spherical.
How do you count the drops on a coin?
Holding the eyedropper close to the surface of the coin, carefully squeeze water droplets onto the coin, one at a time. The droplets should pool up on the coin, creating a big droplet of water. Get the students to count the drops. Stop squeezing when the droplet on the coin breaks up and overflows.
What happens when you drop water on a penny?
As a water drop builds up and out, usually bulging over the sides of the penny, the cohesive forces will eventually be overcome by the force of gravity on the water molecules. The “skin” will burst, and all of the water will spill off.
How does cohesion and adhesion of water affect droplets?
When cohesion is more of a factor, the water forms spherical droplets; when adhesion is more of a factor, we get sheets of water. The wax on the wax paper, it would seem, acts like the oil. You might have read somewhere that wax and oil are hydrophobic and might think that the wax and water are repelling one another.