Hello, teachers and leaders:

Welcome to Science DreamWorks Club. This semester, our club has carried out 14 experiments, including friction, atmospheric pressure, chemistry, circuit, electromagnetism, microscope and so on. Next, our club will show you the results of our study this semester in the form of "series of experiments on science and technology". First of all, please ask Wang Ziyi to introduce the "magic balloon" to everyone, and ask relevant students to show it together.

Scientific experiment refers to the social practice form of observing and studying natural phenomena and their regularity under the condition of manual control by using certain instruments, equipment and other material means according to certain purposes. It is an important way to obtain empirical facts and test the authenticity of scientific hypotheses and theories.