Why do they make a sound later?

Light travels faster than sound! You see the flash instantly, but the sound takes time to reach your ears.

Nature

Painting the Sky: The Chemistry of Hanabi

April 13, 2026Ages 3–9

Key Insight

Hanabi use spherical 'Stars' and different metal salts (Strontium for red, Barium for green) to create their famous displays.

📖 Explanation

🧒 For Ages 3-5 (Simple Words)

Fireworks are like flowers in the sky! We use different magic powders to make the red, blue, and green colors explode in circles.

🎒 For Ages 6-9 (Science Talk)

Flame Test Chemistry

Different elements glow different colors when heated. Strontium = Red, Copper = Blue, Barium = Green. Japanese 'Hanabi' are famous for their perfect spheres because the 'Stars' are packed in a precise geometric pattern inside the shell.

❓ Frequently Asked Questions

Why do they make a sound later?: Light travels faster than sound! You see the flash instantly, but the sound takes time to reach your ears.

Step 1 / 2

🧪 Rainbow Flame Test

~15 min

See the chemical colors of fireworks.

🛒 Supplies

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📋 Steps

1
🔥 Heat Salts
Dip a wire into saltwater or Borax and put it in a blue flame.
2
🌈 Observe
Watch the flame turn orange or green. That's exactly how fireworks get their color!

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