What is the significance of a vapor density greater than 1?

A vapor density greater than 1 indicates that the vapor is heavier than air. This is significant in a fire fighting context because heavier-than-air vapors tend to accumulate in low-lying areas and confined spaces. When these vapors are released, they can displace oxygen, creating an asphyxiation hazard and increasing the risk of fire or explosion if they reach an ignition source.

Understanding vapor density helps firefighters assess the potential behavior of chemicals in the atmosphere and ensures they take proper precautions when dealing with spills or leaks. It's crucial for making informed decisions about ventilation, containment, and rescue operations in areas where heavy vapors may be present.