Chemistry teaching experiment involves many dangerous factors, such as chemicals, fire sources and power sources. Therefore, the principle of safety should be emphasized to ensure the health and life safety of experimenters. There are several reasons:

1. Avoid accidents: chemicals, fire sources, power supplies, etc. Are potential risk factors in chemical experiments. If the experimenter does not have enough safety awareness and measures, it is easy to have accidents, resulting in casualties and property losses.

2. Environmental protection: Chemicals and wastes used in chemical experiments may pollute the environment, such as being discharged into air and water, so we should pay attention to environmental protection to avoid adverse effects on the environment.

3. Improve the experimental quality: The safety measures in the experiment can not only ensure the safety of personnel, but also improve the experimental quality. If the experimenter is distracted by security issues, it may affect the accuracy and reliability of the experimental results.