How does a chemical with a vapor density greater than one (1.0) act?

A chemical with a vapor density greater than one (1.0) is heavier than air. This characteristic means that when such a chemical is released into the atmosphere, it does not rise like lighter gases. Instead, it tends to move downward and accumulate in low-lying areas and below-grade spaces, such as basements, trenches, or any depressions.

This behavior is critical for understanding the risks associated with chemical spills or leaks, as it affects how the chemical spreads and where it may pose a danger to people and the environment. Being aware of this characteristic helps responders plan their actions effectively, ensuring that they take precautions in areas where harmful vapors may concentrate.