What is the specific gravity (SG) of Hydrogen sulfide (H2S)?

The specific gravity (SG) of a substance is a measure that compares the density of that substance to the density of water. For gases, this is typically measured at standard temperature and pressure. Hydrogen sulfide (H2S) has a specific gravity of approximately 1.191, which indicates that it is denser than air but is lighter than many other gases.

This specific gravity value means that H2S is heavier than air, contributing to its behavior in the environment. When released into the atmosphere, H2S can accumulate in low-lying areas due to its density, which may pose safety hazards in confined spaces. Understanding the specific gravity of H2S is crucial for safety protocols in environments where this gas may be present, as it helps in assessing the risk of gas accumulation.

The other choices provided represent values that do not accurately reflect the density of hydrogen sulfide compared to water or air. Therefore, the correct choice not only highlights H2S's density but also underlines the practical implications of working with this substance in various industrial and environmental settings.