how do fireworks form those cool shapes?

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how do fireworks form those cool shapes?

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The fireworks designers know the physics and the chemistry and use that info to build fireworks that will explode in certain patterns(physics) and give off certain colors (chemistry) [https://www.businessinsider.com/how-fireworks-get-iconic-shapes-hearts-smiley-faces-2016-6](https://www.businessinsider.com/how-fireworks-get-iconic-shapes-hearts-smiley-faces-2016-6).

The add various shaped charges into the firework to achieve different effects, different chemicals burn brighter and in different spectrum than others so will have different colours and intensities. Longer fuses and packaging create delays for the explosions.