Will a penny hold more water if it is soapy?

Will a penny hold more water if it is soapy?

Gravity flattens the droplets, cohesion holds the droplets together, and adhesion holds the drops on the surface of the coin. Soapy water makes smaller drops than plain water. Since soapy drops are smaller, more soapy drops will fit on a penny than plain water drops. Count ’em!

How many drops of soapy water can you fit on a penny?

11 drops
Our results were interesting. I knew that the oil should have less surface tension than the water, but we had equal results – 23 drops for each. Soapy water had the least surface tension. We were only able to get 11 drops of soapy water on the penny.

Why do pennies with soap hold less water?

This is because plain tap water has higher surface tension, so the surface is “stronger” and can hold together a larger drop. Adding soap lowers the water’s surface tension so the drop becomes weaker and breaks apart sooner.

Which side of a penny holds more water?

heads side
The results indicate that when you drop water on a penny that the heads side of the penny will hold more drops (heads 23 drops, tails 18 drops).

How is the water strider able to walk on water?

Water striders are able to walk on top of water due to a combination of several factors. Water striders use the high surface tension of water and long, hydrophobic legs to help them stay above water. Water striders use this surface tension to their advantage through their highly adapted legs and distributed weight.

Why does the head side of the penny hold more water?

Water’s cohesion and surface tension are special because of hydrogen bonds. The cohesion and surface tension of water becomes apparent when the drops of water you add to the penny reach the penny’s edge. Once the water has reached the edge, you begin to see a bubble or dome of water forming on top of the penny.

What happens when you put water on a penny?

As drops of water are added onto a penny, the adhesive force between the water and the penny keeps the water from falling off. Cohesive forces are strong, but not unbreakable.

How to count how many water drops fit on a penny?

The kids followed these instructions to find out how many drops of water can fit on a penny and other coins: Set the coin on a flat surface. Fill a plastic pipette with water. Carefully squeeze out water drop by drop from the pipette onto the coin. Count how many drops fit on the coin before the dome breaks and the water spills over.

What happens when you add coins to glass of water?

You’ll notice that the water hangs slightly over the top of the glass but doesn’t spill out just yet. Now, add the coins one at a time to the glass of water, dropping them in rim-first (not face down). Guess how many coins you can add to the glass before the water starts to overflow!

How does light affect the size of a penny?

The place the water lands on also has an effect on it. To be even more accurate, light has a mass. If light shines directly at the water on a penny, it could push it a tiny bit. This change is impossible to see, and it has basically no effect on the penny or water at all whatsoever.