Why are lab doors kept open during a lab?

• A. So another person is within easy calling distance
• B. To save energy
• C. To decrease noise
• D. To keep heat in

Answer: (A)

The main idea is safety through quick help and supervision. Keeping the door open means another person is nearby who can hear you, see what’s happening, and call for help or come to assist immediately if something goes wrong—such as a spill, exposure, or injury. That nearby presence reduces response time and increases the chance that hazards are noticed and addressed quickly.

The other reasons shown aren’t the primary focus of lab safety in this context. Saving energy, reducing noise, or keeping heat in aren’t the central goal when thinking about rapid assistance and communication during a lab incident.