The small experiments and principles in the Science and Technology Museum include electrostatic experiment, Bernoulli principle experiment, sound wave experiment and light interference experiment.

1. Electrostatic experiment: This experiment makes use of the interaction between charges. Friction on the balloon will generate static electricity, which will attract other objects when the balloon is close to them.

2. Bernoulli principle experiment: This experiment demonstrates Bernoulli principle. The faster the flow rate, the smaller the pressure. When water flows through the pipeline, the air velocity below the pipeline will be faster than that above the pipeline, resulting in lower air pressure below than above, thus generating upward lift.

3. Sound wave experiment: This experiment produces sound waves through vibration. Tap a metal pipe lightly, and the air in the pipe will generate sound waves due to vibration. These sound waves can travel back and forth in the pipe and be sensed at the other end.

4. Light interference experiment: When two light waves meet, if their phase difference is an integer multiple of the wavelength, light interference will occur. In some positions, interference will double the light intensity and form bright stripes, while in other positions, interference will cancel the light intensity and form dark stripes.

Benefits of children doing experiments:

1. Enhance scientific literacy and knowledge understanding: experiment is an important means of scientific inquiry. Children can understand scientific knowledge more intuitively and improve their scientific literacy by doing experiments by themselves. They can observe phenomena and find problems in practice, so as to understand scientific principles more deeply. For example, by conducting simple chemical experiments, children can understand the changes and properties of substances and enhance their understanding of chemistry.

2. Cultivate the spirit of inquiry and innovation: experiments give children opportunities to explore the world. They can find problems in experiments, put forward assumptions, and then verify their assumptions through practice. The cultivation of this spirit of inquiry is very beneficial to the development of children's innovative ability.

3. Improve the ability to solve problems and the spirit of cooperation: In the process of doing experiments, children need to face various possible problems, such as equipment failure and unsatisfactory experimental results.

They need to learn to calmly analyze problems, find out the reasons and try to solve them. Many experiments need teamwork, which can not only improve children's teamwork ability, but also help them learn the importance of mutual help and respect. For example, when conducting biological experiments, it may be necessary to cooperate in groups, and each person is responsible for part of the work to complete the experiment.