Not all gas densities are the same! Some are lighter than air, and some are heavier. This means that not all gases rise; some sink and collect in low-lying areas, displacing oxygen and creating invisible traps. Every crew must know what sort of gas they might be dealing with and how it behaves. For example, propane collects near the ground, while helium rises to the ceiling. Understanding how density changes the risk factor of each scenario is the difference between life and death.   

What this means for you: 

• Apply this knowledge during hazard assessments, train your employees to ask themselves where a leak might concentrate. 

• Train crews to check pits, trenches, and enclosed spaces when working with heavier-than-air gases.  

• Reinforce that even though you can’t see or smell the danger, that doesn’t mean it isn’t there. Gas monitors, not human senses, confirm safety.