Where Does The Fizz Come From?

When Coke is made, carbon dioxide gas (CO₂) is squeezed into the drink under pressure.

The gas stays hidden inside the liquid until the bottle is opened.

Think of it like a spring being held down — the moment the lid comes off, the gas wants to escape!

Why Do Mentos Make It Erupt?

Bubbles need somewhere to start forming.

Scientists call these tiny bubble starting points nucleation sites.

A bubble can’t easily appear in the middle of a liquid, but it can form on a rough surface.

Mentos might look smooth, but under a microscope, they’re covered in thousands of tiny pits and scratches.

Each tiny pit becomes a launch pad for a bubble.

Why Does The Coke Shoot Into The Air?

When the Mentos drop into the Coke, thousands of bubbles form at the same time.

Those bubbles quickly grow larger and larger.

As they rush upward, they push the liquid above them.

The result is a giant foamy fountain that blasts out of the bottle like a mini volcano!

What Does Temperature Change?

Warm Coke and cold Coke both contain carbon dioxide gas.

But warm liquids hold dissolved gases less effectively than cold liquids.

That means the gas in warm Coke can escape more easily.

Will that make the warm volcano erupt higher?