What does vapor density measure?

Vapor density specifically measures the weight of an airborne substance relative to the weight of dry air. This is important in hazardous materials management because understanding vapor density helps determine how a gas or vapor will behave in the atmosphere. If a substance has a vapor density greater than that of air, it will tend to settle closer to the ground, which can create hazardous situations, especially in confined spaces. Conversely, if its vapor density is less than that of air, it will rise and disperse into the atmosphere.

The focus on weight comparison to dry air makes vapor density a key concept in assessing the potential risks associated with the release of various gases, particularly in emergencies and environmental assessments. Understanding vapor density allows for better planning and response strategies when dealing with hazardous materials.