Sessile drop technique

Hello little one! Do you know what a drop is? Yes? Okay great! Now imagine a drop of water or oil sitting very, very still on a surface. This is called a sessile drop.

Scientists and engineers are interested in sessile drops because they can tell them important things about the surface the drop is sitting on. They can measure things like how sticky or slippery the surface is, how much the drop spreads out, and how much it beads up.

One way they measure these things is by using a technique called the sessile drop technique. Basically, they take a drop of liquid and carefully place it onto the surface they want to study. Then, they use special tools to measure things like the size of the drop, the angle it makes with the surface, and how quickly it spreads out or beads up.

This information can help scientists and engineers design new materials, coatings, and technologies that do cool things like repel water, stick to things really well, or lubricate surfaces. It's like a magic trick, but with science!