浪漫光影“绽放”浓浓年味 180秒探秘烟花背后“黑科技”

Group 1 - The article highlights the vibrant fireworks displays across various cities in China during the Spring Festival, showcasing the blend of technology and artistry behind these events [1][4] - The chemical reactions involved in fireworks, such as the combination of sulfur, charcoal, and potassium nitrate, create high-temperature gases that propel the fireworks into the sky [3] - The sound effects produced by fireworks are attributed to the use of specific chemical compounds, which create pulsating combustion that generates sound waves [3] Group 2 - Different colors in fireworks are achieved by incorporating various metal salts, such as strontium for red and barium for green, which exhibit unique flame colors when heated [6] - The arrangement of star bodies within the firework is crucial for creating specific patterns in the sky, with engineers using precise computer controls for multi-point launches [8] - The duration of fireworks displays can be extended by modifying the propellant's chemical composition, allowing some fireworks to linger longer in the sky [10]