Difference between revisions of "Carbon dioxide"

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Molar Mass of 12(C)+32(O<sub>2</sub>)=44
 
Molar Mass of 12(C)+32(O<sub>2</sub>)=44
  
==Biological significance ==
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==Biological significance==
 
The metabolism of [[human|human beings]], [[:category:animals|animals]] and various [[microbes]] depends on the oxidation of [[carbohydrate]]s, resulting in carbon dioxide and water exhalation.  [[:Category:Plants|Plants]] use the [[carbon]] from carbon dioxide  to produce [[carbohydrates]]  and release the [[oxygen]] back to the [[atmosphere]], completing the cycle.  
 
The metabolism of [[human|human beings]], [[:category:animals|animals]] and various [[microbes]] depends on the oxidation of [[carbohydrate]]s, resulting in carbon dioxide and water exhalation.  [[:Category:Plants|Plants]] use the [[carbon]] from carbon dioxide  to produce [[carbohydrates]]  and release the [[oxygen]] back to the [[atmosphere]], completing the cycle.  
  
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The Sabatier process can be used in place of photosynthesis to complete the atmospheric part of the carbon cycle.  Synthesis of carbohydrates from methane would be required to complete the carbon metabolic cycle without the use of plants.  Or food can be supplied from Earth or Mars for a partial cycle, where Methane from the Sabatier process can be stored for use as a propellant.
 
The Sabatier process can be used in place of photosynthesis to complete the atmospheric part of the carbon cycle.  Synthesis of carbohydrates from methane would be required to complete the carbon metabolic cycle without the use of plants.  Or food can be supplied from Earth or Mars for a partial cycle, where Methane from the Sabatier process can be stored for use as a propellant.
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== Concentration ==
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Concentration of CO2 on Earth is about 400 ppm.  Increasing concentration improves plan production rates, however the effect is non linear and reaches a peak of 20% improvement in yields at about 1200 ppm.<ref>University of California, Agriculture and Natural ressources https://ucanr.edu/blogs/NurseryFlower/</ref>
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[[File:CO2 concentration.jpg|thumb|Effect of CO2 concentration on plant production]]
  
 
==Uses==
 
==Uses==

Revision as of 06:24, 20 July 2020

Carbon dioxide[1] (chemical formula: CO2) is a chemical substance that occupies about 96 % of Mars's atmosphere.

Molar Mass of 12(C)+32(O2)=44

Biological significance

The metabolism of human beings, animals and various microbes depends on the oxidation of carbohydrates, resulting in carbon dioxide and water exhalation. Plants use the carbon from carbon dioxide to produce carbohydrates and release the oxygen back to the atmosphere, completing the cycle.

The reaction is: CO2(carbon dioxide) + 2H2O (water) + photons (light energy) → C(n)H2O(m) (carbohydrate) + O2(oxygen)+ H2O (water)[2]

Production

CO2 will be extracted in-situ by atmospheric processing using compression and cooling.

Settlement atmosphere

Colony CO2 treatment.png

Carbon dioxide is required in the settlement atmosphere for plant metabolism. Standard concentration on Earth is increasing, so the value is a moving target. However, a concentration between 300ppm (0,03%) and 1000ppm (0,1%) is considered acceptable[3]. Nuclear submarines have varying carbon monoxide levels that can reach 9000 ppm in normal operations.

The Sabatier process can be used in place of photosynthesis to complete the atmospheric part of the carbon cycle. Synthesis of carbohydrates from methane would be required to complete the carbon metabolic cycle without the use of plants. Or food can be supplied from Earth or Mars for a partial cycle, where Methane from the Sabatier process can be stored for use as a propellant.

Concentration

Concentration of CO2 on Earth is about 400 ppm. Increasing concentration improves plan production rates, however the effect is non linear and reaches a peak of 20% improvement in yields at about 1200 ppm.[4]

Effect of CO2 concentration on plant production

Uses

References