N Haidu All-Media Reporter Chen Jiangyan Mao Chaoqing Text/Photo
On October 12, the third lesson of " Tiangong Classroom " was held in China Space Station . In order to promote the spirit of aerospace, spread aerospace knowledge, and inspire the enthusiasm of the whole people to explore and innovate in aerospace, on the 15th, the "Tiangong Classroom" activity month of the Fujian Science and Technology Museum was officially launched. Science and Technology counselors will take everyone to review the series of courses of "Tiangong Classroom" through rich and interesting scientific experiments.
15, in the "Little Jasmine Science Workshop" activity class, the children revisited the content related to surface tension in the "Tiangong Classroom". Through the two experimental links of "experience surface tension" and "Who is stronger surface tension", we can understand what magical performance of surface tension in non-gravity environments and gravity environments, and feel the differences between heaven and earth.
Technology counselor teaches in the event
See the changes of water droplets and feel the mystery of "surface tension"
"The binding force of liquid mainly comes from surface tension. How powerful is the 'magic' of tension ?" After the event class began, technology counselor Yang Chuanqing and the children reviewed the "water membrane tension" experiment, "liquid bridge demonstration" experiment and "capillary effect in microgravity environment" experiment in the "Tiangong Classroom" in turn. The principles of these experiments are all related to surface tension.
Among them, in the "water membrane tension" experiment, the astronaut made a water membrane and continuously added water to the water membrane through a water bag. The water film not only did not break, but slowly thickened, gradually forming a uniform spherical "big water droplet". "This is the surface tension of water that shows its power"!" Yang Chuanqing explained that the surface tension of water is a macro manifestation of the interaction force between water molecules on the microscopic, and it exists on the surface of the earth and in space. "It is like the hand of a water membrane, constantly pulling excess water to your side."
So, how will surface tension exert its "magic" on the ground? In the next experiment, the children dripped water into the bottle cap filled with water through the test tube to feel the existence of "surface tension". "I dripped 53 drops of water, and the water began to overflow. Why is this?" the child asked curiously. It turns out that on the ground, water is still affected by gravity. When the water droplets become larger, the surface tension of the water cannot withstand the gravity of the water, and the water begins to overflow. Using the different surface tension of liquids, , drop a few drops of pigment in the center of the water surface or place a small foam board, use a test tube to drop alcohol or foam liquid on one side, and you can also see the magical scene of the pigment or small foam board being "pulled" from the low surface tension to the high surface tension side.
came to the Provincial Science and Technology Museum in October to experience "Go to the World and the Sea"
Science and Technology Counselor Yang Chuanqing introduced that after the "Tiangong Classroom" activity month of the Provincial Science and Technology Museum was launched, every weekend, the Provincial Science and Technology Museum will take everyone to review the series of courses of "Tiangong Classroom", pay attention to a scientific principle every weekend, and take children to experience the mystery of aerospace through experiments, explanations and other links. Next, the Provincial Science and Technology Museum will also bring about capillary phenomena, centrifugal forces and buoyancy in the "Tiangong Classroom". Interested citizens can follow the official WeChat account of "Fujian Science and Technology Museum" to learn about the event content.
In addition to the "Tiangong Classroom" course, there are also a variety of exhibits such as "Jiaolong No. 1" in the Provincial Science and Technology Museum. The exhibits use AR interactive technology to "immerse" to experience the scientific and technological achievements in my country's various fields of sea, land and air. Among them, "Jiaolong One" is a 1:1 submersible model. Citizens can explore the underwater world through AR glasses and experience my country's advanced deep-sea surveying technology.
Fujian Science and Technology Museum reminds all citizens: 1. According to relevant epidemic prevention and control requirements, visitors to the museum must present the health code , itinerary code and a negative nucleic acid test certificate within 72 hours, and cooperate with temperature measurement, scanning code registration, self-service disinfection of hands; 2. During the visit, wear masks throughout the whole process, consciously take personal protection, maintain social distance from others, and obey the guidance and management of staff in the museum; 3. Those who do not wear masks, have abnormal body temperature (large equal to 37.3℃) or have symptoms such as dry cough, fatigue, and sore throat, and abnormal health code and itinerary code. No 72-hour nucleic acid test certificate will be refused entry.
Edited by: Chen Chen
