Which term describes the tendency of a fuel to become hazy due to wax formation at low temperatures?

• A. Cloud Point
• B. Demulsification
• C. Viscosity
• D. Storage Stability

Answer: (A)

Cloud point is the property that describes when fuel turns hazy as the temperature drops because paraffin wax begins to crystallize and scatter light. This haziness marks the temperature at which solid wax particles start to form in the liquid, signaling cold-weather behavior important for fuels like diesel. Demulsification refers to separating water from fuel, not wax-induced haziness. Viscosity describes how thick or resistant to flow a liquid is, which changes with temperature but doesn’t define the hazy appearance from wax. Storage stability concerns how well fuel resists degradation over time, not the formation of wax solids. For context, the cloud point is related but distinct from pour point, which is the lowest temperature at which fuel will still pour.