🔍 Key Concepts

• Saybolt viscosity scales used in marine fuels (e.g., Universal vs. Furol) • Difference between measuring time and measuring volume or distance in viscosity tests • Which Saybolt scale is commonly associated with heavier (residual) fuel oils

💭 Think About

• Ask yourself: when viscosity is measured with Saybolt methods, what is the unit actually counting as the oil flows through the orifice? • Think about which Saybolt method is used for light/distillate oils versus heavy/residual oils in marine engineering practice. • Look at the answer choices and decide which ones are realistic physical units for a time-based viscosity measurement.

✅ Before You Answer

• Confirm that Saybolt viscosity values are expressed in time units, not in volume or length units. • Identify which Saybolt scale name is traditionally paired with residual (heavy) fuel oils, as opposed to diesel or lighter distillates. • Eliminate any choices that do not express a unit of time in a realistic way for a lab test (seconds vs. minutes, volume, or length).