火箭是我国最早发明的。宋代的“火龙”两侧有4支用火药作燃料的火箭,点燃后,燃料燃烧产生的气体快速从尾处喷出,“火龙”便向前飞去(图1)。现代火箭虽然使用的燃料不同,但 Rocket was invented in China first. In the Song Dynasty, there were four rockets that were propelled by gunpowder flames on either side of the fire dragon. After being ignited, the gas generated by the combustion of fuel was quickly ejected from the tail and the “dragon” flew forward (Figure 1). Although the modern rocket uses different fuels,