Why should long hair be tied up during experiments?

During experiments, long hair should be tied up primarily to keep it away from the Bunsen burner. Open flames pose a significant risk, and having loose hair can lead to dangerous situations, such as hair catching fire. The correct choice emphasizes the importance of safety in the laboratory environment.

While keeping hair tied back can also help prevent it from getting wet or from coming into contact with chemicals, which could cause spills or contamination, these factors are secondary in importance to the risk posed by open flames. Compliance with school regulations is also a consideration, but it primarily serves as part of the broader safety protocols rather than being the main reason for tying back hair during experiments. Thus, the focus on preventing hair from coming into contact with flames underlines the necessity of maintaining a safe working environment.