As a future teacher, I love activities that let students discover science in small, everyday wonders. One simple but fascinating experiment is placing water droplets on a coin and observing what happens in class. I did this experiment at home. It’s a perfect way to explore surface tension, cohesion, and adhesion concepts that are often in textbooks but come to life in this hands-on activity.

Materials

• A coin

• A dropper

• Water

Steps

1. Place the coin on a flat surface.

2. Fill the dropper with water.

3. Slowly add water droplets to the center of the coin, one at a time.

4. Count how many droplets you can add before the water spills over.

5. Observe the shape of the droplets

Students will see that the droplets stick together (cohesion) and to the coin’s surface (adhesion), creating surface tension that holds the water in a dome shape.

Reflection

This activity reminds me that science doesn’t always need fancy equipment or complex experiments. Some of the most powerful learning happens when students interact with something simple and see principles in action. As a future teacher, I want to create experiences where students can touch, test, and wonder, and then connect those observations to scientific concepts.

Placing water droplets on a coin may seem small, but it teaches patience, observation, and critical thinking that students carry beyond the classroom. It also reinforces the idea that science is everywhere, waiting to be noticed in the world around us, even in the tiny domes of water on a coin