Classical limit

When we talk about the "classical limit," it means that we are looking at something in a way that is similar to the way things behave in ordinary life.

Imagine you are playing with a toy car. If you push the car gently, it will start to move slowly, and if you push it harder, it will move faster. This is how things behave in the "classical" world that we see around us every day.

But in the world of physics, things can behave very differently. For example, if we look at very tiny particles like electrons, they behave more like waves than like tiny balls that we can push around. And when we try to observe these particles, they can actually change their behavior in unexpected ways. It's like trying to take a picture of someone who knows they're being photographed - they might act differently than they would if they didn't know you were there.

So when we talk about the "classical limit," we mean that we are looking at things in the world of physics in a way that is similar to how we expect things to behave in our everyday life. We are simplifying things to make them easier to understand, because the world of physics can be very complicated and confusing.