(1) Cut the paper into pieces with specifications as shown in the figure. Stick one side of the first paper and one side of the second paper together, and then stick the third and fourth papers together in turn until a ball with holes at both ends and a diameter of about 60 cm is synthesized. Cut another round piece of paper and stick the air holes on it. When it's dry, blow up the balloon and find it.
(2) ignite the alcohol cotton ball and stick it in the center of the wire. After the air inside the balloon is heated, the balloon will fly from the ground to the sky, as shown in the figure.
(3) This is because the air inside the balloon is heated and expanded, and part of it runs outward, so that the buoyancy of the air received by the balloon is greater than the weight of the balloon (including the hot air inside the balloon), so that the balloon will rise.
Lanterns, also known as lanterns and sky lanterns, are made of white paper paste. According to the principle of hot air balloon, air is lifted off by the heat generated by thermal expansion. The fuel it carries can float about 1 hour. At first, it looks like an unknown flying object. After rising to a certain height, it looks like a star.
According to legend, it spread from the mainland to Hainan and evolved into a very distinctive local folk custom. On festive days or grand festivals, people light lanterns to express their good wishes. Before lighting lanterns, people should write down their wishes on the lanterns. Ran Ran will rise to the sky with the lanterns to pray that their wishes can come true.
In the villages around Wenchang, Wanning and Danzhou, there are folk customs of tying lanterns and putting them out. Because the Wenchang accent "Sky Lantern" is homophonic with "Tianding", the boy family spontaneously formed a "Lantern Delivery Team", and used lanterns with auspicious words such as lanterns, lanterns, hand lanterns, flower basket lanterns, carp lanterns and rare ancient lanterns to beat gongs and drums, and walked around the village to the temple, indicating that they would be sent to "a prosperous population and a prosperous family scene". When putting the lantern on, pour the oil on the rag with the barrel mouth facing down. After the tarpaulin is lit, the whole paper bucket will be filled with hot air, and the sky lanterns of every household will rise like hot air balloons. Take your blessings and wishes and float into the night sky.