When a substance has a vapor density of 1.1 or greater, what will happen?

A substance with a vapor density greater than 1.0 is heavier than air. This means that when such a substance is released into the environment, it will tend to settle to the ground or move downward rather than rise. In this case, a vapor density of 1.1 indicates that the substance is significantly more dense than air, reinforcing the likelihood that it will fall rather than rise or remain suspended.

Understanding vapor density is crucial in fire operations, as it influences how gases behave in the atmosphere during incidents such as fires or chemical spills. Knowing that a substance will fall allows firefighters to plan appropriate safety measures and response strategies when dealing with hazardous materials.