4First RocketThe first rockets made in China and the Middle East with the discovery of gunpowder. These rockets were used for military purposes or as entertainment. The use of rockets and gunpowder would eventually to change warfare, and to this day we still use rockets in pretty much the same way they were used 700 years ago
14Rocket engines are reaction engines Rocket engines are reaction engines. Remember the famous Isaac Newton principle that "to every action there is an equal and opposite reaction."
15เครื่องยนต์จรวดคือ เครื่องยนต์ปฏิกิริยา จำหลัก Isaac Newton มีชื่อเสียงที่ "กระทำทุก มีเท่ากันและตรงกันข้ามปฏิกิริยา"
16A rocket engine is generally throwing mass in the form of a high-pressure gas. The engine throws the mass of gas out in one direction in order to get a reaction in the opposite direction. The mass comes from the fuel that the rocket engine burns.