Carbon Dioxide

Carbon dioxide.

Slide 6

A common type of industrial gas laser is the carbon dioxide laser.

Carbon dioxide is used in enhanced oil recovery where it is injected into or adjacent to producing oil wells, usually under supercritical conditions

Liquid and solid carbon dioxide are important refrigerants, especially in the food industry, where they are employed during the transportation and storage of ice cream and other frozen foods. Solid carbon dioxide is called “dry ice” and is used for small shipments where refrigeration equipment is not practical.

In enhanced coal bed methane recovery, carbon dioxide is pumped into the coal seam to displace methane.

Carbon dioxide in the form of dry ice is often used in the wine making process to cool down bunches of grapes quickly after picking to help prevent spontaneous fermentation by wild yeasts.

Slide 7

Carbon dioxide is sometimes used to top up wine bottles or other storage vessels such as barrels to prevent oxidation

Carbon dioxide can be used as a mean of controlling the pH of swimming pools, by continuously adding gas to the water, thus keeping the pH level from rising.

Slide 8

Carbon dioxide in earth’s atmosphere is considered a trace gas currently occurring at an average concentration of about 390 parts per million by volume or 591 parts per million by mass.The total mass of atmospheric carbon dioxide is 3.0×1015 kg (3,000 gigatonnes).

Up to 40% of the gas emitted by some volcanoes during subaerial eruptions is carbon dioxide.It is estimated that volcanoes release about 130-230 million tonnes (145-255 million tons) of CO2 into the atmosphere each year.

Slide 9

There is about fifty times as much carbon dissolved in the sea water of the oceans in the form of CO2 and carbonic acid, bicarbonate and carbonate ions as exists in the atmosphere.

The oceans have absorbed about 50% of the carbon dioxide (CO2) released from the burning of fossil fuels, resulting in chemical reactions that lower ocean pH. This has caused an increase in hydrogen ion (acidity) of about 30% since the start of the industrial age through a process known as “ocean acidification.” A growing number of studies have demonstrated adverse impacts on marine organisms, including:

The rate at which reef-building corals produce their skeletons decreases.

Slide 10

Role in photosynthesis   

Overview of photosynthesis and respiration. Carbon dioxide (at right), together with water, form oxygen and organic compounds (at left) by photosynthesis, which can be respired to water and (CO2).

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