ELI5: Explain Like I'm 5

Proton gyromagnetic ratio

Okay, so imagine you are playing with a toy top. You spin the top around and around, and it keeps moving because it has momentum. In a similar way, tiny things called protons spin around inside an atom. We call this spinning "spin angular momentum."

Now, when the top slows down, it starts to wobble and move in different ways, and that's because it's affected by things like gravity and friction. The same thing happens to protons as they spin around. They can be affected by things like magnetic fields, which can change the way they spin and make them wobble.

Scientists have figured out how to measure this wobbling, or "precession," and they use something called the "proton gyromagnetic ratio" to do it. This ratio tells you how much the proton's spin is affected by a magnetic field. It's like a special number for protons that helps scientists understand how they work.

So the proton gyromagnetic ratio is just a way for scientists to measure how much magnetic fields affect the tiny spinning protons inside an atom. It's kind of like measuring how much the wind affects your toy top when you spin it.