What is the specific gravity of Carbon Dioxide (CO2)?

The specific gravity of a substance is defined as the ratio of the density of that substance to the density of a reference substance, typically water at 4 degrees Celsius for liquids and air for gases. In the case of carbon dioxide (CO2), its specific gravity is approximately 1.529 when compared to air, meaning it is heavier than air.

This specific gravity indicates that carbon dioxide molecules are denser than air molecules, which are primarily made up of nitrogen and oxygen. As a result, CO2 can accumulate in lower areas and is important to consider in various applications, including ventilation, respiratory physiology, and environmental monitoring.

The values assigned to the other answers do not reflect the density of CO2 relative to air accurately, leading to the conclusion that the specific gravity of carbon dioxide is indeed around 1.529.