Boyle's law

Boyle's Law is an idea about how gases work. Gases are a type of matter that can fill up a space, like the air you breathe. Boyle's Law says that if you squash a gas into a smaller space, the pressure of the gas will go up. So if you have a balloon full of air and you push on it, the air inside the balloon will start pressing back on you harder.

This idea might seem simple, but it works in a lot of fancy science stuff. Scientists use Boyle's Law to figure out how much air needs to go into tires so that they're the right amount of squishy, or to design airplanes that can fly high up in the sky. In fact, Boyle's Law is one of the reasons that we can breathe - when we take a breath in, the air gets sucked into our lungs because the pressure outside of our body is higher than the pressure inside our lungs. When we breathe out, the pressure inside our lungs gets higher, so the air gets pushed back out.

Overall, Boyle's Law helps us understand how gas behaves and how we can use it in all sorts of cool ways.