What is the specific gravity of carbon monoxide?

The specific gravity of a gas is a measure of its density in comparison to air, which is assigned a specific gravity of 1. Carbon monoxide has a specific gravity of approximately 0.96, meaning it is slightly lighter than air. This property is essential in HVACR applications as it influences how carbon monoxide behaves in the atmosphere, particularly in terms of ventilation and accumulation risks. Understanding its specific gravity helps technicians evaluate safety measures when dealing with carbon monoxide in various environments, especially since it can lead to hazardous situations if it accumulates in enclosed spaces. The provided answer accurately reflects this important characteristic of carbon monoxide.