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The session aims to understand the work of Agnes Pockels, whose research contributed to our understanding of surface science. It will involve experiments designed to elucidate surface tension, polarity, and the action of surfactants.
We will need:
1. Water
2. Coin (Make sure it’s round)
3. Glass
4. Liquid Dish Soap
5. Dropper
6. Oil (cooking oil or coconut oil will do)
7. Spoon
8. Bottle
9. Slides for presentation
We are going to give a brief introduction to the concept of surface tension
Explain to students that surface tension acts like a skin on the surface of water, holding the water molecules together tightly.
We are aiming to help the students recognize examples of surface tension
Discuss how surface tension allows insects to walk on water without sinking and causes water droplets to form round shapes on leaves.
We are going to introduce students to Agnes Pockels, who is one of the first women in STEM.
She is considered to be the pioneer of surface science.
Explain that surfactants are substances that can reduce surface tension, making it easier for different substances to mix.
Show them the working of surfactants using this video:
The students are going to explore surface tension using common household items
Explain all the materials required and how we will be using them
We are going to compare the differences in the amount of drops of water and soap solution a coin can hold.
Ask students to observe how the water droplets are rounded when added to the coin surface
This solution can be made before the lesson starts.
Make sure that you do not stir the solution vigorously.
We are aiming to compare the differences in the amount of drops in each case
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