Cohesion number

Okay, imagine you are playing with Legos. You have lots of different colors and shapes of Legos to build with. Some of them have little nubs that stick out and some have little holes that the nubs can fit into. When you build something with Legos, you want it to stay together and not fall apart, right?

Well, cohesion number is kind of like that for molecules. Molecules are tiny particles that make up everything around us, like water, air, and even our own bodies! Just like Legos, some molecules have little nubs or bumps that stick out, and some have little holes where those bumps can fit in.

When scientists study molecules, they sometimes want to know how strong the attraction is between the bumps and holes. This is where cohesion number comes in. It is a measure of how much the bumps and holes are attracted to each other - or how well the Legos are stuck together. The higher the cohesion number, the stronger the attraction and the more likely the molecules are to stick together and form a solid or liquid.

So, cohesion number is really just a way of measuring how well molecules stick together, like Legos. It helps scientists understand how different substances behave and how they might react with each other. Pretty cool, right!?