Okay kiddo, let me explain what liquid breathing is like you're 5 years old.
Breathing is when we take in air through our nose or mouth and it goes into our lungs. Our lungs take the oxygen from the air and give it to our blood, which then carries it around our body to help us breathe and stay alive.
Liquid breathing is kind of like that, but instead of breathing air, we breathe a special liquid that can carry oxygen. This liquid is called perfluorocarbon, or PFC for short.
So instead of filling our lungs with air, we fill them with this liquid that has oxygen dissolved in it. The liquid is very special because it can dissolve a lot of oxygen, so we can get more oxygen in our body than we can by breathing air.
But how do we breathe the liquid? Well, we need a special machine called a liquid ventilator. This machine pumps the liquid in and out of our lungs, just like how we breathe air in and out.
Liquid breathing can be very helpful for people who can't breathe air very well. For example, if someone has a lung disease or injury, their lungs might not be able to take in enough air to keep their body healthy. But with liquid breathing, they can still get enough oxygen to stay alive.
So that's liquid breathing, kiddo. It's a way for people to breathe a special liquid that has oxygen in it, to help them stay healthy when their lungs can't take in enough air.