Scientific experiment is a teaching method to observe and verify scientific principles and theories through experiments. Small scientific experiments are usually simple experiments, but they can help students understand scientific principles through their own practice and improve their interest and understanding of science.

The principles of scientific experiments mainly include the following aspects:

1. scientific principles: scientific experiments need to be based on certain scientific principles, and students can observe and verify scientific principles through experiments, so as to better understand and master scientific knowledge.

2. Experimental design: Scientific experiments need to design reasonable experimental steps and methods to make the experimental results accurate and reliable.

3. Experimental process: Small scientific experiments require students to operate, observe experimental phenomena and record experimental data.

4. Result analysis: Scientific experiments require students to analyze and explain the experimental results, so as to better understand and apply scientific principles.

5. Experimental application: Scientific experiments need to apply experimental results to real life, so as to better understand and apply scientific knowledge.