Materials to be prepared include: hydrogen balloons, cups, toothpicks, scissors and ribbons.
1, prepare a hydrogen balloon first.
2. Then drill two holes in the paper cup.
3. Pass both ends of the ribbon through the hole of the paper cup and tie a knot to fix it.
4. Then tie the middle part of the ribbon to the internal hydrogen balloon.
5. Put a toothpick in the paper cup to increase the weight. At this time, the hydrogen balloon is in a state of landing on the table.
6, slowly take out the right amount of toothpicks, the hydrogen balloon will slowly float in the air, and the hand-made hot air balloon will be completed.
Hot air balloons generally use propane or liquefied petroleum gas, and gas cylinders are fixed in hanging baskets. A hot air balloon can carry 80 kilograms of liquid fuel.
Hot air balloon is a practical aircraft, and the small hot air balloon made by ourselves will also rise to the sky.
The materials and tools needed for this experiment are: two completely opened tissues, iron wire, bamboo strips, cotton, alcohol or kerosene, scissors, glue or paste.
The manufacturing method is as follows: Fold two pieces of completely opened paper in half along the long side, spread the other two pieces of completely opened paper on the upper and lower sides of the origami, and stick four side strips along the long side, with the upper mouth and the lower mouth obliquely attached. Because the glued paper balloon is large, it should be folded and made flat. Compared with the size of the lower mouth.
Bend a big bamboo circle, tie an iron wire horizontally in the bamboo circle, tie a cotton ball or rag with iron wire in the middle of the iron wire, tie three Suu at the bottom circle, and tie a long line after folding, so that the balloon can hold the ball after it is lifted off, so that it won't catch fire.
When flying, soak cotton balls in alcohol or kerosene. Two people lifted the paper ball and one lit it under the ball. When the flame heats the air in the paper ball, the balloon will slowly rise to the sky. Another way of flying is not to tie a fire to the bottom ring of the balloon, but only to heat the air in the balloon and let it fly across the sky. This is not dangerous, the air in the ball will automatically fall back after cooling.
Knowledge expansion:
Hot air is lighter than ordinary air, hot inside and cold outside, and the sphere can rise. But when making a hot air balloon, the sphere can't be made small, it can only be made bigger. The larger the volume of hot air, the easier it will float and the longer it will stay in the air.