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Gasoil, often referred to as diesel oil or simply diesel, is a middle distillate derived from the crude oil refining process. It possesses properties between those of lighter fuels like gasoline and heavier fuels like lubricating oil. Gasoil is used as both a fuel and a processing element in various industries. Primary Characteristics: Appearance: Clear to slightly hazy, ranging in color from light straw to amber. Odor: Characteristic petroleum smell. Density: Varies based on specific grade and blend but generally denser than gasoline. Cetane Number: Indicator of the combustion speed of diesel fuel and compression needed for ignition. Specifications: Gasoilâ??s quality and classification often adhere to standards set by organizations such as ASTM (American Society for Testing and Materials) or equivalent regional standards. Variations include Ultra-Low Sulfur Diesel (ULSD), Low Sulfur Diesel, and others. Applications: Automotive: Fuel for diesel-engine vehicles, such as trucks, buses, and cars. Industrial: Used in various industrial machines and engines, including generators. Marine: Fuel for certain types of marine vessels. Heating: Used in some regions as heating oil for homes and businesses. Power Generation: Fuel for diesel-powered electricity generators. Advantages: Energy Dense: Provides more energy per gallon compared to gasoline, leading to longer fuel economy in diesel engines. Efficient: Diesel engines often convert fuel to energy more efficiently than their gasoline counterparts. Reliable: Known for its durability and reliability in heavy-duty applications.

Crude oil, often simply called "crude," is an unrefined petroleum product composed of hydrocarbon deposits and other organic materials. It is a liquid found underground that can be refined to produce various fuels, including gasoline, diesel, and jet fuel, as well as other products like plastics and chemicals. Classification: Based on its specific gravity (API gravity) and sulfur content, crude oil can be classified into: Light or Heavy: Determined by its API gravity with light crude oil being less dense and, therefore, more valuable than heavy crude oil. Sweet or Sour: Based on its sulfur content. Sweet crude has less than 0.5% sulfur, while sour crude has a higher sulfur content. Physical Characteristics: Color varies from yellow to black. Viscosity can range from water-like to thick and tar-like. Distinctive odor, often pungent. Applications: Fuel Production: Main source for gasoline, diesel, kerosene, and jet fuel after refining. Petrochemicals: Base for manufacturing chemicals, plastics, synthetic materials, and more. Lubricants: Processed to produce motor oil, grease, and other lubricating products. Asphalt: Used in road construction. Storage & Handling: Crude oil is typically stored in large tanks or transported in pipelines, tankers, or rail cars. Proper care is needed during transportation to prevent spills and environmental contamination. Note: Crude oil's quality and characteristics can vary widely based on its geographical origin and the conditions under which it was formed. Before refining or using, a detailed analysis is usually performed to understand its composition and how best to process or utilize it.