Sky class 2023 talked about spherical flame experiment, wonderful "table tennis" experiment, momentum conservation experiment and gyro experiment. The relevant contents are as follows:

1, spherical flame and wonderful "table tennis" experiment: The phenomenon of spherical flame produced by candle burning in microgravity environment is demonstrated, and the influence of gravity on the combustion process and the significance of combustion research in microgravity environment are explained. The wonderful "table tennis" experiment is to hit the water polo with a "special" table tennis racket to explain the surface tension of water and the structural characteristics of hydrophobic substances.

2. Momentum conservation experiment and gyro experiment: demonstrate and explain the collision phenomenon of steel balls with different masses in microgravity environment. See also gyro experiment: demonstrating the conservation of angular momentum under static and rotating conditions by using metal gyro in microgravity environment.

Sky classroom related knowledge

1, Sky Classroom is an important popular science education activity carried out by China Space Station, aiming at popularizing space science knowledge and achievements of space exploration to the vast number of teenagers and the public through the interaction between heaven and earth. Sky Class is not only a popular science education activity, but also an important platform to show China's space technology and exploration achievements.

2. Sky class gave its first lecture on February 9th, 202 1, 1. Taking advantage of the special conditions of the space environment, the three astronauts demonstrated various activities such as space science experiments, space teaching, and interaction between heaven and earth, involving physics, chemistry, biology, mathematics and other disciplines.

3. On June 5th, 2023, in the third class of Sky Class, the astronauts showed a number of experiments, including buoyancy disappearance experiment, water film tension experiment, water polo optical experiment, effervescent tablet experiment and so on, explaining the relevant scientific principles and knowledge in a simple way. Through the sky class, we can also stimulate young people's scientific interest and innovative spirit.

4. Tiangong-2 Space Laboratory has carried out many space science experiments and technical experiments, including space environment exploration, space physics research, space materials research and microgravity fluid physics research. These experiments and studies not only help to promote the progress of scientific research, but also provide important support for the future survival and development of mankind in space.