🔍 Key Concepts

• Hydrogen sulfide (H₂S) formation and its typical sources on ships • Difference between sewage/organic decay gases and gases from fuels, batteries, or cleaners • Characteristics of confined spaces where organic material sits undisturbed

💭 Think About

• Which space listed is most associated with rotting organic material and biological decay? • In which option would you expect breakdown of waste that can produce sulfide compounds, rather than chemical additives or electrochemical reactions? • Which compartment, if poorly ventilated, could trap foul-smelling, toxic gases produced by microbial action?

✅ Before You Answer

• Identify which choice involves organic waste or sewage, not fuel, solvents, or batteries • Think about where rotting material might sit in bilges for long periods with little ventilation • Recall that H₂S often smells like rotten eggs and is common in sewage and waste treatment areas