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minhphuoc48nct
2 năm trước
HOT AIR BALLOON A hot air balloon is a type of aircraft. By heating the air inside the balloon with fire, it is lifted up. Hot air weights less than cold air which means that hot air will rise up or float when there is cold air around. It is just like a bubble of air in a pot of water. The balloon can carry more weight on a cold day or if the air inside the balloon is very hot. In China, they used hot air to make objects fly and the first use of the knowledge was used to send lanterns into the air for signaling. The hot air balloon is the oldest form of flying technology that successfully carried people. The first hot air balloon to carry a person was made by the French Montgolfier brothers. On September 19, 1783, they demonstrated their invention for King Louis XVI and Queen Marie Antoinette at the French court in Paris. The balloon flew for a period of 20 minutes. 1. What is hot air balloon? 2. How can hot air balloon fly? 3. In what case does a hot air balloon carry more weight? 4. What did Chinese people use hot air for? 5. How meaningful of the hot air balloon to carrying people? 6. Who made the first hot air balloon to carry a person? 7. On what days was the hot air balloon demonstrated at the presence of King Louis XVI and Queen Marie Antoinette? 8. How long did the balloon fly for?
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