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A Study On Carbon Dioxide Gas

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LITERATURE STUDY
2.1 Carbon dioxide gas
2.1.1 Overview
Carbon dioxide, in its gaseous form, is a natural constituent gas of the Earth’s terrestrial atmosphere [5]. According to the standards outlined by The International Institute of Refrigeration the chemical formula for carbon dioxide is CO2 and the refrigerant code for carbon dioxide is R744 [6]. CO2 gas is poisonous to living organisms when inhaled in a sufficiently concentrated form. The molecule of carbon dioxide consists of two oxygen atoms bonded to one carbon atom. It can be produced by the combustion of hydrocarbons, as the product of breathing of living people and animals and by fermentation [7]. The carbon dioxide molecule is illustrated in the figure that follows: Figure 2: Carbon dioxide molecule [8].

2.1.2 Physical properties
The following table contains some important properties of carbon dioxide:
Table 1: Carbon dioxide properties [7].
Property: Value:
Molecular weight 44.01 g/mol
Critical temperature 30.98 ℃
Critical pressure 73.77 bar
Critical density 467.6 kg/m3
Triple point temperature -56.56 ℃
Triple point pressure 5.187 bar
Gas density @ 1.013 bar and sublimation point 2.813 kg/m3
Gas specific gravity 1.53
Gas viscosity @ 1.013 bar and 0 ℃ 1.3711 x 10-3 Poise
Thermal conductivity @ 1.013 bar and 0 ℃ 14.674 mW/(m.K)
Specific heat (constant pressure) @ 1.013 bar and 25 ℃ 0.0374 kJ/(mol.K)
Specific heat (constant volume) @ 1.013 bar and 25 ℃ 0.0289 kJ/(mol.K)
Ratio of specific heats

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