Exousia Global Concepts

 Crude oil taken from an underground reservoir is extraordinarily valuable, but it is not yet petrol, diesel or jet fuel. It is a complex mixture containing hundreds to thousands of different hydrocarbon compounds, together with sulfur-containing compounds, nitrogen compounds, salts, water, metals and other materials. A petroleum refinery transforms this complex raw material into useful products through carefully controlled physical and chemical processes. This is where organic chemistry, industrial chemistry, thermodynamics, chemical engineering and environmental science meet on an enormous scale. What Is a Petroleum Refinery? A petroleum refinery is an industrial facility designed to separate, convert, treat and blend crude-oil components into marketable products. These products can include: Petrol or gasoline Diesel fuel Aviation turbine fuel or jet fuel Liquefied petroleum gas (LPG) Naphtha Kerosene Lubricants Fuel oils Bitumen/asphalt Petroleum coke Petrochemical feedstocks A ...

 Crude oil and natural gas have enormous economic importance, but their usefulness ultimately begins at the molecular level. At the center of petroleum chemistry is a remarkably simple combination of elements: carbon and hydrogen. Compounds containing only these two elements are known as hydrocarbons. From methane containing one carbon atom to enormous molecules present in heavy petroleum fractions, differences in molecular structure produce dramatically different physical and chemical properties. Understanding hydrocarbons provides the foundation for understanding petroleum refining, natural-gas processing, petrochemicals, fuels, plastics and industrial chemistry. What Is a Hydrocarbon? A hydrocarbon is an organic compound composed entirely of carbon (C) and hydrogen (H). � The Department of Energy's Energy.gov Examples include: Methane — CH₄ Ethane — C₂H₆ Propane — C₃H₈ Butane — C₄H₁₀ Octane — C₈H₁₈ Carbon's ability to form stable bonds with itself allows carbon atoms to prod...

 Modern civilization depends heavily on petroleum. Petrol and diesel power vehicles. Jet fuel powers aircraft. Natural gas supplies energy and industrial feedstock. Petroleum-derived materials contribute to plastics, chemicals, lubricants, paints, synthetic materials and numerous manufactured products. Yet crude oil begins far from the refinery. Its story starts with geology, organic matter, sediment, heat, pressure and enormous periods of geological time. What Is Petroleum? The word petroleum broadly refers to naturally occurring hydrocarbon-rich materials found within Earth's geological formations. Two especially important forms are: Crude oil — petroleum that occurs predominantly as a liquid under appropriate reservoir and surface conditions. Natural gas — gaseous hydrocarbons, typically dominated by methane. Crude petroleum is not one pure chemical substance. It is a complicated mixture containing many different hydrocarbons along with smaller quantities of compounds containing...

Every meal begins an extraordinary biological journey. The food we eat contains carbohydrates, proteins, fats, vitamins, minerals and water, but most nutrients cannot simply move from a meal directly into the body's cells. Food must first be mechanically and chemically processed into forms that can be absorbed and used. This is the work of the digestive system. Understanding digestion connects human biology, chemistry, biochemistry, nutrition, microbiology and medicine. What Is the Digestive System? The digestive system consists of the gastrointestinal tract together with accessory organs that contribute to digestion. The gastrointestinal tract includes: Mouth Pharynx Esophagus Stomach Small intestine Large intestine Rectum Anus Important accessory organs include the salivary glands, liver, gallbladder and pancreas. Together, these structures break food down, absorb nutrients and water, and eliminate material that the body cannot digest or use. Digestion Begins in the Mouth Digesti...

 Every minute of every day, whether you are awake or asleep, your respiratory system is working. You inhale air containing oxygen. Inside the lungs, oxygen enters the bloodstream while carbon dioxide produced by cellular metabolism moves from the blood into the lungs to be exhaled. This continuous exchange connects directly with our previous article on the heart and circulatory system. The lungs bring oxygen into contact with the blood. The heart then helps circulate oxygenated blood throughout the body. Understanding respiration therefore connects human biology, physiology, chemistry and medicine. What Is the Respiratory System? The respiratory system is the collection of organs and structures involved in ventilation and gas exchange. Its major components include: Nose and nasal cavity Pharynx Larynx Trachea Bronchi Bronchioles Lungs Alveoli Diaphragm and other respiratory muscles Together, these structures move air into and out of the lungs and provide an enormous surface for gas...