The Physics Behind 3D Fireworks Finale

What 3D Fireworks Finale Is

The 3D Fireworks Finale simulation showcases the complex interplay of physics involved in creating dazzling fireworks. It highlights how rapid chemical reactions and gas expansion lead to the spectacular visual displays we see.

By simulating these processes, the simulation helps us understand key concepts such as thermodynamics, combustion, and the behavior of gases under extreme conditions.

Why It Happens

When fireworks are ignited, a rapid exothermic chemical reaction occurs within the firework's payload. This reaction produces heat and generates large volumes of gas, primarily carbon dioxide and nitrogen oxides, which expand rapidly.

The expansion of these gases creates pressure that propels the firework upwards, while the intense heat causes the surrounding air to ionize, creating a bright flash and sound.

Combustion and Color

The colors in fireworks are produced by the combustion of metal salts. Different metals emit light at specific wavelengths when heated, resulting in distinct colors. For example, strontium compounds produce red, barium produces green, and copper or silver produce blue.

These colored flames are created as the hot gases from the explosion rise through a tube filled with these metal salts, causing them to decompose and emit light.

Thermodynamics in Action

The principles of thermodynamics govern the behavior of the gases within fireworks. The first law of thermodynamics (conservation of energy) is evident as chemical energy from the fuel is converted into thermal and kinetic energy.

The second law, which states that entropy increases over time, explains why the hot gases expand and disperse, creating a visible explosion.

Frequently asked questions

Try it live

Everything above runs in your browser — open 3D Fireworks Finale and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.