CO2 rocket

A CO2 rocket is a special kind of rocket that runs on air! We all know that we need air to breathe, and you breathe in oxygen and breathe out carbon dioxide. CO2 rockets work the other way round.

Imagine a bottle of soda, like Coca-Cola or Pepsi. When you open the bottle, the CO2 in the drink rushes out of the bottle and makes bubbles. A CO2 rocket works the same way.

The rocket is usually a cylinder made out of sturdy material like plastic or metal, and it has a little hole at the bottom. You fill the bottle with some water, and then you put in a special kind of gas that's in a canister. This gas is called CO2 or carbon dioxide.

When you finally put the canister in the rocket and open the valve, the CO2 rushes out and makes a big, powerful blast of air. This pushes the water out of the hole at the bottom of the cylinder, and your rocket shoots up into the sky!

The science behind this is that when we release the CO2 from the canister, it expands really fast because there's no pressure stopping it. And when gas expands like that, it gets really cold. This cold gas moves much faster than the air outside the rocket, and this creates an upward force that lifts the rocket high into the sky.

So, a CO2 rocket is a really fun way to explore the world of physics and chemistry, and see how powerful air can be!