🔍 Key Concepts

• Energy content of fuels (BTU per pound) and why it matters for efficiency • Effects of sulphur and acids in fuel combustion and engine/boiler maintenance • Relationship between carbon content and heat output in hydrocarbon fuels

💭 Think About

• Which fuel property will allow a ship to travel farther on the same weight of fuel? • What are the negative consequences of sulphur and acidic by‑products in boilers and exhaust systems? • Does lower carbon per pound generally mean more or less heat energy for typical marine fuels?

✅ Before You Answer

• Identify which option directly relates to heat (BTU) output per unit weight of fuel • Eliminate any option that would increase corrosion or pollution in the boiler or exhaust system • Confirm which properties are typically minimized (undesirable) versus maximized (desirable) in marine fuel oil specifications