The main content of the second class in Tiangong Classroom is that during the 60-minute lecture, the astronauts Zhai Zhigang, Wang Yaping and Ye Guang Fu of Shenzhou XIII flight crew vividly introduced the working and living scenes of the space station and explained the scientific principles behind the experiment. The main content of the second lesson in Tiangong classroom.
Main content of the second lesson of Tiangong Classroom1On March 23rd, the second lesson of Tiangong Classroom was held in China Space Station. Shenzhou XIII astronauts Zhai Zhigang, Wang Yaping and Ye Guangfu had another wonderful space science class.
Space "ice and snow" experiment, liquid bridge demonstration experiment, water-oil separation experiment, space parabolic experiment ... Three "space teachers" demonstrated the experiment in the form of interaction between heaven and earth, and introduced and displayed space science facilities. This fantastic space teaching has made the seeds of science take root in the hearts of hundreds of millions of young people.
According to the China Manned Space Engineering Office, on March 23rd 15: 44, the second class of "Tiangong Classroom" was held in China Space Station, and Shenzhou XIII astronauts Zhai Zhigang, Wang Yaping and Ye Guangfu had another wonderful space science class. The second space teaching activity of China Space Station was a complete success.
The main classroom on the ground is located in China Science and Technology Museum, and the sub-classrooms are located in Lhasa, Tibet and Urumqi, Xinjiang respectively. This teaching activity is co-sponsored by China Manned Space Engineering Office, Ministry of Education, Ministry of Science and Technology, China Association for Science and Technology and CCTV, and supported by China Science and Technology Museum and related research and experimental units of manned space engineering. The lecture was broadcast live to a global audience.
warm up
Review the first lecture.
A few days before the start of the course, the contents of the space lecture have been announced to the public. Astronauts will conduct space "ice and snow" experiments, liquid bridge demonstration experiments, water-oil separation experiments and space parabolic experiments on the space station orbiting the earth, and introduce and display space science facilities. I saw the "class schedule" early, and the students in the ground class were looking forward to it. In the ground preheating session, the students reviewed the teaching content of the first space station "Tiangong Classroom", the "three-step" course of China's manned spaceflight project, and the knowledge about weightlessness in space.
The "space teacher" is coming! Three astronauts came to the camera and stood in a row in blue overalls.
"Space exploration is endless. Hello, everyone. I'm Wang Yaping, the space teacher. I'm glad we meet again. Today is the second class of our Tiangong class ... "Wang Yaping's face and voice once again appeared in the Tiangong class, bringing the students into the class.
"I am commander Zhai Zhigang and continue to be a photographer."
"I am astronaut Ye Guangfu, and I am very happy to share the scientific knowledge in space with you again."
With the experience of teaching in the space station for the first time, the three "space teachers" are familiar with it and once again lead everyone into the wonderful world of weightlessness in space.
Empirical test
"Ice and snow" experiments, water-oil separation, space parabolic and so on have been staged one after another.
In connection with the 2022 Beijing Winter Olympics, Wang Yaping demonstrated the experiment of "ice and snow" in space for the first time. I saw that she took out a transparent bag filled with supersaturated sodium acetate solution, and the mouth of the bag was connected with a straw. She carefully squeezed the solution out of the bag, gradually formed a transparent liquid ball at the mouth of the straw, and then gently touched the ball below with a hairy root with a little crystal nucleus.
After several attempts, like magic, the transparent ball quickly became a crystal ball. Wang Yaping explained that crystals release heat when they precipitate, so they are "hot balls" that feel very hot.
"This is the surface tension of liquid in microgravity environment, which makes the extruded liquid form a full and uniform liquid ball." Wang Yaping uncovered the mystery. In order to show students the surface tension more intuitively, Wang Yaping followed up another experiment. She is holding two transparent liquid bridge boards, and Ye Guangfu is holding a bag full of drinking water, squeezing a water polo on the two liquid bridge boards respectively.
At the same time, the students in the ground class are doing the same experiment simultaneously. When the two water polo balls became bigger and bigger and stuck together, she slowly pulled them apart and built a strange "liquid bridge".
Next, Wang Yaping encountered a "difficult problem" in the space buoyancy experiment.
I saw her holding a small bottle containing two liquids. Transparent water and yellow cooking oil. After Wang Yaping shook the bottle with his classmates on the ground, there was a completely different phenomenon between the "Tiangong Class" and the ground class. Water and oil are immiscible. On the ground, oil is lighter than water, so it will float on the water, but not in the microgravity environment of the space station.
The liquid in the bottle in the student's hand gradually stratified, while the water and oil in Wang Yaping's hand remained the same as before, without any change. What shall we do? Wang Yaping asked his classmates in the ground class for help. A classmate suggested: "Use rotation to separate water from oil through centrifugation." Wang Yaping adopted this suggestion. Ye Guangfu demonstrated that the rope was tied to the bottle mouth and spun quickly. In a short time, the mixed liquid in the bottle was separated.
"Small principles can play a big role. The space station also has such centrifugal equipment to separate and prepare some liquids. Many complex devices are simple scientific principles, such as gyroscopes in space stations. " Wang Yaping added another knowledge point to everyone.
After demonstrating the wonderful liquid phenomenon in space, Wang Yaping started the last experiment-the parabolic experiment in space, with the purpose of describing the basic principle of Newton's first law. At this time, a lovely little ice pier appeared. Wang Yaping gently pushed the ice pier with his finger, but it didn't fall off, but slowly drifted to Ye Guangfu one or two meters away. Ye Guangfu caught it and pushed it to Wang Yaping. The ice mound moves back and forth between the two people in an approximately uniform linear motion.
"Classmates, my space station is actually flying around the earth. From your point of view, is the ice pier moving in an approximately uniform straight line? Why? " Wang Yaping gave the students homework.
After demonstrating interesting experiments for the students, Wang Yaping and Ye Guangfu introduced two new scientific experimental cabinets on the space station-the high microgravity experimental cabinet and the containerless material experimental cabinet, and showed the progress of space science experiments in this mission.
The purpose of building a space station is to build a space laboratory, which also means that laboratories on earth can be moved into space.
"Scientific experiments are an important means to help scientific research. The scientific experiment cabinet is the main facility for our scientific experiments in the space station. After the candlestick experimental module and Dream Day experimental module are online, we will add more experimental cabinets and carry out scientific experimental projects in more fields. By then, Chinese and foreign scientists can rely on the experimental cabinet to carry out research, and the China Space Station will become a space science platform for the benefit of all mankind. "
Ye Guangfu said: "Students, we are also eagerly looking forward to your own scientific experiment ideas. Maybe next time your experimental project will be displayed in space. "
interaction
Questions and answers between teachers and students are full of whimsy.
In the final questioning session, netizens and students in the ground class threw out many interesting questions, which were answered by three astronauts.
"What's it like to cry on the space station? Is it as long as jelly, or will it pop out one by one? "
Wang Yaping replied: "Tears can't flow naturally like lying on the ground, but roll around in the eyes or corners of the eyes. So it may be difficult to hold back tears and pretend to be strong on the ground, but it is easy for us to do it in space. "
"Is there any difference between the moon we see on the space station and the moon we see on the earth?"
"Our space station is about 400 kilometers away from the Earth, and the Earth is 380,000 kilometers away from the Moon. Looking at the moon on the space station is not much different from looking at the moon on the ground, but because there is no interference from the atmosphere and clouds on the earth, the moon we see on the space station is brighter and clearer. " Zhai Zhigang answered.
"Do I have a chance to be a scientist who can do experiments in space?"
Ye Guangfu encouraged: "With the completion of the space station, more researchers will come to the space station to conduct scientific experiments. Students are very welcome to do experiments in the space station in the future, or they can submit their own experimental projects to the space station and then operate remotely on the ground. "
1 plate nearly 1 hour of space teaching passed quickly in the interaction between heaven and earth, and it was time to "finish class".
"Students, the future belongs to you!"
"Exploring the vast universe, developing the space industry and building a space power are our unremitting pursuits. Space dream! I hope that the students will seize the day, live up to glory, and move forward firmly on the road of chasing dreams! "
"Flying dreams will never lose weight, and the tension of scientific dreams is infinite! I hope that students will continue to study hard on scientific knowledge, improve their scientific literacy and explore scientific mysteries. The future space station will be built by you! "
After sending blessings and expectations to the students, the three astronauts waved goodbye to the camera. Another space lecture full of whimsy once again sowed the seeds of science and took root in the hearts of hundreds of millions of young people.
How to treat the main content of the second lesson in Tiangong classroom?
1. The mobile terminal can click on the video number of People's Daily to make an appointment to watch.
2. TV can enter CCTV's comprehensive, news and children's channels to watch.
3. The computer can enter CCTV to watch.
4. Friends who don't have time to watch the live broadcast can watch the live video on CCTV and other platforms.
The second lesson of "Tiangong Classroom" is scheduled to start at China Space Station on March 23rd 15: 40, and will be taught by Shenzhou XIII astronauts Zhai Zhigang, Wang Yaping and Ye Guangfu.
This space teaching activity takes the form of dialogue between heaven and earth. Astronauts will demonstrate space "ice and snow" experiment, liquid bridge demonstration experiment, water-oil separation experiment and space parabolic experiment. On-orbit, and introduce and display space science facilities, aiming at spreading and popularizing space science knowledge and inspiring young people's enthusiasm for pursuing "scientific dreams" and realizing "space dreams".
A Brief Introduction to the Second Lesson of "Tiangong Classroom"
The first class of Tiangong Classroom lasts about 60 minutes, and the second class of Tiangong Classroom is expected to last about 60 minutes. Specifically, it is mainly based on the specific curriculum.
The first lesson of Tiangong Classroom officially started at 202165438+February 9 15: 40 Beijing time. China astronauts taught in space again, which is the first time that China Space Station taught in space.
During the 60-minute lecture, the astronauts Zhai Zhigang, Wang Yaping and Ye Guang Fu of the Shenzhou 13 flight crew vividly introduced the working and living scenes of the space station, demonstrated the magical phenomena such as cytology experiment, human movement and liquid surface tension in microgravity environment, and explained the scientific principles behind the experiment. During the lecture, astronauts interacted with teachers and students in the ground class in real time through video call.
The main content of the second lesson of Tiangong Classroom On the afternoon of March 23rd, the second lesson of Tiangong Classroom was officially opened at China Space Station. Shenzhou 13 astronauts Zhai Zhigang, Wang Yaping and Ye Guangfu gave lectures in collaboration, and demonstrated the space "ice and snow" experiment, liquid bridge demonstration experiment, water-oil separation experiment and space parabolic experiment in orbit, explaining the scientific principles behind the experimental phenomena.
In this space lecture, the main classroom on the ground is located in China Science and Technology Museum, and the two sub-classrooms on the ground are located in Lhasa, Tibet and Urumqi, Xinjiang respectively. During the lecture, astronauts interacted with teachers and students in the ground class through video call.
The experiment of "ice and snow" in space is to use saturated sodium acetate solution, squeeze a water balloon along the mouth of the bag, and then touch it with a plastic stick to form a ice hockey. This liquid ball that looks like ice hockey is actually a hot ball. This is actually an anhydrous sodium acetate experiment, which is different from the ground. Because of microgravity, the water polo is not limited by the container, and the crystallization can develop outward, which is quite different from the ground experiment results.
In the demonstration experiment of liquid bridge, water connects two plastic plates under the action of surface tension, and a bridge can be built with liquid in space, which shows the characteristics of liquid surface tension very vividly and intuitively. A new dielectric polarization mechanism is introduced into the ground liquid bridge experiment. Although the phenomena look similar, they actually have different principles.
In the experiment of oil-water separation, water and oil are mixed. Generally, because the density of water is higher than that of edible oil, when the two liquids are mixed on the ground, the oil will float on the water surface, forming a stable stratification phenomenon. Even if it is shaken, it will be layered after standing. However, after natural shaking in space, water and oil did not naturally separate. But there is no gravity and buoyancy in space, so after shaking, the oil will become small oil droplets and be evenly dispersed in the water. This process is how centrifuges work.
Space Parabolic Experiment The Olympic Top Stream "Ice Shield" made a high-profile appearance. After it was thrown by astronauts on the space station, it did not do parabolic motion like on the ground, but flew out horizontally, which is the most intuitive embodiment of the microgravity environment of the space station.
Astronauts also showed how to wet towels with both hands. The water in the towel forms a water film, which sticks to the hand, like gloves, and will not fall off when shaken. Tie-dyeing is a traditional and unique handicraft in China, which was brought to the space station. First, the fabric is tied, sewn, tied, sewn and clamped by means of yarn, thread, rope, etc., so that the tied part keeps its true color, and then the fabric is dyed with dyes such as Banlangen. The final color is blue and white, which looks like a parachute.
Tie-dyeing in space makes students feast their eyes and learn more about traditional culture, witnessing the wonderful integration of traditional culture and modern technology for thousands of years.