carbon-dioxide

matter

Definition: Carbon dioxide (chemical formula CO2) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature, and as the source of available carbon in the carbon cycle, atmospheric CO2 is the primary carbon source for life on Earth. In the air, carbon dioxide is transparent to visible light but absorbs infrared radiation, acting as a greenhouse gas. Carbon dioxide is soluble in water and is found in groundwater, lakes, ice caps, and seawater. When carbon dioxide dissolves in water, it forms carbonate and mainly bicarbonate (HCO−3), which causes ocean acidification as atmospheric CO2 levels increase.It is a trace gas in Earth's atmosphere at 421 parts per million (ppm), or about 0.04% by volume (as of May 2022), having risen from pre-industrial levels of 280 ppm. Burning fossil fuels is the primary cause of these increased CO2 concentrations and also the primary cause of climate change.Its concentration in Earth's pre-industrial atmosphere since late in the Precambrian has been regulated by organisms and geological phenomena. Plants, algae and cyanobacteria use energy from sunlight to synthesize carbohydrates from carbon dioxide and water in a process called photosynthesis, which produces oxygen as a waste product. In turn, oxygen is consumed and CO2 is released as waste by all aerobic organisms when they metabolize organic compounds to produce energy by respiration. CO2 is released from organic materials when they decay or combust, such as in forest fires. Since plants require CO2 for photosynthesis, and humans and animals depend on plants for food, CO2 is necessary for the survival of life on earth.

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Occurs in:

• atmosphere_air_carbon-dioxide~equilibrium__partial_pressure
• atmosphere_air_carbon-dioxide__partial_pressure
• atmosphere_air_carbon-dioxide__relative_saturation
• atmosphere_air~saturated_carbon-dioxide__partial_pressure
• atmosphere_bottom_air_carbon-dioxide~equilibrium__partial_pressure
• atmosphere_bottom_air_carbon-dioxide__partial_pressure
• atmosphere_bottom_air_carbon-dioxide__relative_saturation
• atmosphere_bottom_air~saturated_carbon-dioxide__partial_pressure
• atmosphere_air_carbon-dioxide__partial_pressure
• automobile_carbon-dioxide_emission__mass-per-length_rate
• sea_surface_air_carbon-dioxide__partial_pressure
• sea_surface_water_carbon-dioxide__partial_pressure
• sea_water_carbon-dioxide__mass_concentration
• sea_water_carbon-dioxide__partial_pressure
• sea_water_carbon-dioxide__solubility
• sea_water_carbon-dioxide__volume_concentration
• water_carbon-dioxide__solubility