Ethylene is a gaseous organic compound. Ethylene is an important raw material for the chemical industry and feedstock for 30 percent of all petrochemicals. Ethylene is used for the production of many plastics, including polyethylene (PE), polyvinyl chloride (PVC), PET, cellulose acetate and polyvinyl acetate polymer. Ethylene is used in the production of specialty glass for the automotive industry (car glass). Ethylene is used as oxy-fuel gas in metal cutting, welding and high velocity thermal spraying. Ethylene is used as refrigerant, especially in LNG liquefaction plants. Ethylene is used in the extraction of rubber. Ethylene was used as a general anesthetic in major as well as minor surgery: tonsillectomies, appendectomies, Caesarian sections, hysterectomies, gastro-enterostomies, cholecystectomies, and other operations where the age of the patient ranges from three days to eighty-four or five years. Ethylene is the first-identified plant hormone known to regulate numerous processes in plant growth, development, and response to biotic and abiotic stresses. Ethylene is best known for its effect on fruit ripening and organ abscission, and thus has great commercial importance in agriculture.