Class 7 Exam > Class 7 Videos > Class 7 Oxford Science: Chapter Notes, Worksheets & Tests > How do Hot Air Balloons Work:Example of Warm Air Rises Up
How do Hot Air Balloons Work:Example of Warm Air Rises Up Video Lecture | Class 7 Oxford Science: Chapter Notes, Worksheets & Tests
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FAQs on How do Hot Air Balloons Work:Example of Warm Air Rises Up Video Lecture - Class 7 Oxford Science: Chapter Notes, Worksheets & Tests
| 1. How does a hot air balloon lift off the ground? |  |
Ans.A hot air balloon lifts off the ground because of the principle that warm air rises. The balloon's envelope is filled with hot air, which is lighter than the cooler air outside. When the air inside the balloon is heated using a burner, it expands and becomes less dense, causing the balloon to rise into the sky.
| 2. What materials are hot air balloons made of? | |
Ans.Hot air balloons are primarily made of lightweight, durable materials such as nylon or polyester for the envelope, which holds the hot air. The envelope is often coated with a heat-resistant material to withstand the high temperatures from the burner. The basket, where passengers sit, is usually made of wicker or other strong materials to support the weight.
| 3. How do pilots control the altitude of a hot air balloon? | |
Ans.Pilots control the altitude of a hot air balloon by adjusting the temperature of the air inside the envelope. To ascend, the pilot increases the heat using the burner, which warms the air and causes the balloon to rise. To descend, the pilot allows the air to cool or uses a vent at the top of the envelope to release hot air, making the balloon lighter and causing it to descend.
| 4. Is it safe to fly in a hot air balloon? | |
Ans.Yes, flying in a hot air balloon is generally safe when the flight is conducted by a certified and experienced pilot. Safety measures include regular maintenance of the balloon, checking weather conditions before flying, and following specific guidelines during the flight. Passengers are also given safety briefings before takeoff.
| 5. How high can hot air balloons fly? | |
Ans.Hot air balloons can typically fly at altitudes ranging from a few hundred feet to several thousand feet, depending on the design of the balloon and weather conditions. Most recreational flights stay below 3,000 feet, but some balloons can reach heights of 10,000 feet or more with proper authorization and equipment.
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