Okay kiddo, you know how when you play with toys you can do different things with them like stack blocks or roll a ball? Well, when scientists study really small things that make up everything around us, like atoms and particles, they have their own toys too. These toys are called observables and they help scientists understand how things work.
Now, imagine if you had a few toys that you could play with and each toy was different. Maybe one was a block, one was a ball, and one was a car. You could do different things with each toy depending on what you felt like playing with.
Well, in science, scientists have something called a complete set of commuting observables. That means they have a bunch of toys to play with, but these toys are special because they all work together. Scientists can't always play with just one toy, they need a few different ones to study things really well. And these special observables can be played with together without messing up the results of what they're trying to study.
When scientists play with this complete set of toys, they can learn more about particles and how they interact with each other. It's like they're getting a bigger picture of what's going on. And by understanding how things work at a tiny level, they can help make bigger things work better too, like computers or medicines. So, a complete set of commuting observables is like having a great set of toys that can help scientists learn lots of cool things!