Is hydrogen sulphide considered a flammable gas, and if so, what is the flammability range in air?

Hydrogen sulfide (H2S) is indeed considered a flammable gas, which is an important safety consideration in environments where it may be present. The flammability range of hydrogen sulfide in air is specifically between 4.3% and 45% by volume. This means that H2S can ignite and burn in air when its concentration falls within this range, making it critical for workers and safety personnel to be aware of potential hazards related to its presence.

Understanding the flammability range is essential for risk assessment and implementing safety protocols, as concentrations outside of this range are either too lean (below 4.3%) or too rich (above 45%) to sustain combustion. This knowledge helps ensure proper ventilation and monitoring systems are in place to mitigate risks associated with hydrogen sulfide in various industrial settings.