What is the vapor density of air?

The vapor density of air is typically defined as 1. This value serves as a reference point to compare the densities of other gases. When a gas has a vapor density greater than 1, it is heavier than air and tends to settle closer to the ground. Conversely, gases with a vapor density less than 1 are lighter than air and will rise.

Understanding the concept of vapor density is crucial in hazardous materials response, as it plays a significant role in predicting the behavior of gases during an incident. Knowing that air has a vapor density of 1 allows for effective planning in terms of ventilation and safety measures. It helps responders determine how a gas will disperse in the environment in the event of a leak or spill, allowing them to make more informed decisions in a crisis scenario.