Onsager reciprocal relations

Onsager reciprocal relations help explain how different things relate to each other in a special way. Imagine you have two people, Amy and Bob, and they are playing a game. Amy can throw a ball really far and Bob can jump really high. But they both use their energy to do these things.

Now, let's say Amy wants to know how much energy Bob uses to jump really high. Onsager reciprocal relations tell us that if Amy knows how much energy she used to throw the ball, she can use that information to figure out how much energy Bob used to jump really high.

It's kind of like a secret code that helps us relate different things to each other even if they seem really different. And we can use this code to solve a lot of problems and learn new things about how the world works.