carbon dioxide


carbon dioxide

noun

: a gas that is produced when people and animals breathe out or when certain fuels are burned and that is used by plants for energy

Full Definition of CARBON DIOXIDE

:  a heavy colorless gas CO2 that does not support combustion, dissolves in water to form carbonic acid, is formed especially in animal respiration and in the decay or combustion of animal and vegetable matter, is absorbed from the air by plants in photosynthesis, and is used in the carbonation of beverages

First Known Use of CARBON DIOXIDE

1869

Rhymes with CARBON DIOXIDE

carbon dioxide

noun    (Medical Dictionary)

Medical Definition of CARBON DIOXIDE

: a heavy colorless gas CO2 that does not support combustion, dissolves in water to form carbonic acid, is formed especially in animal respiration and in the decay or combustion of animal and vegetable matter, is absorbed from the air by plants in photosynthesis, and is used in the carbonation of beverages

carbon dioxide

noun    (Concise Encyclopedia)

Inorganic compound, a colourless gas with a faint, sharp odour and a sour taste when dissolved in water, chemical formula CO. Constituting about 0.03% of air by volume, it is produced when carbon-containing materials burn completely, and it is a product of fermentation and animal respiration. Plants use CO in photosynthesis to make carbohydrates. CO in Earth's atmosphere keeps some of the Sun's energy from radiating back into space (see greenhouse effect). In water, CO forms a solution of a weak acid, carbonic acid (HCO). The reaction of CO and ammonia is the first step in synthesizing urea. An important industrial material, CO is recovered from sources including flue gases, limekilns, and the process that prepares hydrogen for synthesis of ammonia. It is used as a refrigerant, a chemical intermediate, and an inert atmosphere; in fire extinguishers, foam rubber and plastics, carbonated beverages (see carbonation), and aerosol sprays; in water treatment, welding, and cloud seeding; and for promoting plant growth in greenhouses. Under pressure it becomes a liquid, the form most often used in industry. If the liquid is allowed to expand, it cools and partially freezes to the solid form, dry ice.

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