What is the lecture about? Let's take a look at the curriculum: At that time, astronauts will demonstrate the space "ice and snow" experiment, the liquid bridge demonstration experiment, the water-oil separation experiment and the space parabolic experiment in orbit, introduce and display the space science popularization facilities, and there will be an interactive link between heaven and earth. Astronauts sincerely invite all walks of life, especially teenagers, to try to carry out relevant experiments simultaneously on the ground.
In the 45-minute lecture, Zhai Zhigang, Wang Yaping and Ye Guang Fu cooperated with each other to vividly demonstrate the space "ice and snow" experiment, liquid bridge demonstration experiment, water-oil separation experiment and space parabola experiment in microgravity environment, and explained the scientific principles behind the experimental phenomena in a simple way. At the same time, they showed some space scientific facilities and introduced the working and living conditions in the space station. During the lecture, astronauts interacted with teachers and students in the ground class through video call.
I still remember the space experiment in the first lesson of "Tiangong Classroom": "Space Fitness", "Cell Culture" and "Buoyancy Disappeared". Among them, what impressed me deeply was that Wang Yaping astronauts showed a wonderful phenomenon completely different from the ground because of weightlessness. In the second lesson of Tiangong Classroom, what impressed me the most was the water-oil separation experiment. We all know that water and oil are separated in normal environment, but in weightless environment, the phenomenon of water-oil stratification disappears. The experiment also shows the phenomenon of stratification through the centrifugal force generated by rotation. It's incredible.
In the parabolic experiment in space, the mascot of the Beijing Winter Olympics, Ice Shield, made a surprise appearance as a "teaching assistant". See Wang Yaping throw the mascot ice pier gently. It didn't fall like it fell to the ground, but moved at a constant speed along the original throwing direction. This is the most intuitive embodiment of the microgravity environment of the space station, and vividly demonstrates the difference between parabolas of heaven and earth.
During the lecture, astronauts interacted with teachers and students in the ground class through video call. In the interactive session between heaven and earth, when it comes to whether the skin will get better in space, Wang Yaping said that since there is no sunlight in the space station, the temperature and humidity are also controlled within a suitable range, and human body fluids will be distributed upwards in microgravity environment, and the skin will be pulled upwards. "So I feel that the skin condition in the space station is very good."
Through the vivid explanation of three astronauts, Tiangong Classroom can let teenagers get a close and in-depth understanding of space knowledge. Intuitively feel the great mystery of science. After reading the second lesson of Tiangong Classroom, I benefited a lot. I not only realized the importance of the aerospace industry, but also became more enthusiastic about scientific knowledge. I wish our motherland a better future by going up a storey still higher, our aerospace industry.