18-01-2013, 10:51 AM
Carbon dioxide
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Carbon dioxide gas is formed from the combination of two elements: carbon and oxygen. It is produced from the combustion of coal or hydrocarbons, the fermentation of liquids and the breathing of humans and animals.
It is found in small proportions in the atmosphere and is assimilated by plants which in turn produce oxygen. Carbon dioxide is a small but important constituent of air. Its typical co
ncentration is about 0.036% or 360 ppm. Exhaled air contains as much as 4% carbon dioxide.
Physical Properties of CO2
CO2 gas has a slightly irritating odor, is colorless and heavier than air.
It cannot sustain life.
It freezes at -78.5 °C to form carbon dioxide snow.
Liquid density : 1032 kg/m3 • Liquid/gas equivalent: 845 vol/vol
Depending on temperature and pressure, CO2 is a gas that exists in a gaseous, liquid or solid state.
Colorless
Inert, non flammable
Odorless
Taste is neutral.
Non toxic
Bacteriostatic
Chemical Properties of CO2
In an aqueous solution it forms carbonic acid, which is too unstable to be easily isolated.
Latent heat of vaporization : 571.08 kJ/kg
Vapor pressure : 58.5 bar
It will not burn or support combustion.