Neutrally buoyant gases have approximately the same density as air, resulting in no intrinsic upward or downward movement. They mix quickly with surrounding atmosphere due to turbulence and vortices, making detection more challenging.
Examples of neutrally buoyant gases include ethylene, ethane, carbon monoxide, and ethanol. When toxic gases mix with air down to workplace limits (ppm range), they reach density equilibrium and behave as neutrally buoyant gases.
Detection strategy requires positioning detectors level with potential release points, considering predominant wind direction, and accounting for rapid mixing characteristics. Due to unpredictable dispersion, multiple detector locations may be required.
The behavior of neutrally buoyant gases is driven by wind or artificial air streams rather than gravity. This makes their dispersion patterns less predictable than dense or buoyant gases, requiring careful placement and multiple detection points.