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Scottish physician and chemist Joseph Black discovered carbon dioxide on June 11, 1754. He noticed that heating calcium carbonate produced a gas much heavier than air. He also noted that it could put out fire. He called the gas "fixed air."


Carbon dioxide is a compound formed by the sharing of two pairs of electrons between each of the two atoms of oxygen and one atom of carbon. This leads to the formation of a double covalent bond between the atoms of oxygen and carbon.


People and animals breathe in oxygen and breathe out carbon dioxide because of a process called cellular respiration. During cellular respiration, oxygen is combined with food nutrients and water in order to produce usable energy in the form of adenosine tri-phosphate (ATP). The byproduct of this pr


Carbon dioxide is considered a greenhouse gas that affects the Earth's atmosphere by causing global warming. This occurs through the emission of too much carbon dioxide into the atmosphere, which is caused mainly by the burning of fossil fuels.


The process in the body that produces carbon dioxide consists of air being taken into the lungs, known as inspiration or inhalation. The air is then taken back out, known as expiration or exhalation.


The normal blood carbon dioxide levels is 23 to 29 milliequivalents per liter (mEq/L). The level of carbon dioxide in the liquid component of the blood is measured by a test called CO2 blood test. The mEq/L value represents 1,000th parts of a substance that is dissolved in 1 liter of plasma or solut


Doctors test the levels of carbon dioxide in the blood by measuring the patient's blood bicarbonate levels, according to MedlinePlus. They draw blood from a vein on the inside of the elbow or the back of the hand. Doctors test the carbon dioxide levels in the serum, or the liquid part of blood.


It is colorless and odorless, and it has a freezing point of -55.6 degrees Celsius. Carbon dioxide is soluble in water, acetone and ethanol. It is an atmospheric gas that is produced by both combustion and respiration.


A normal carbon dioxide level for humans is 23 to 29 milliequivalents per liter, states MedlinePlus. CO2 is primarily found in the form of bicarbonate. A blood test determines how much bicarbonate is in the serum or liquid part of the blood, so the CO2 level is also found.


Carbon dioxide is not polar; it is non-polar. The carbon dioxide molecule has a symmetrical structure, resulting from two identical oxygen atoms attached to a center carbon atom.