carbon dioxide, (CO 2), a colourless gas having a faint sharp odour and a sour taste. Full Form of CO2: Carbon Dioxide Carbon dioxide, commonly abbreviated as CO2, is a chemical compound composed of one carbon atom bonded to two oxygen atoms. It is a colorless and odorless gas that is naturally present in the Earth's atmosphere. CO2 is an essential part of the carbon cycle and plays a crucial role in various biological and physical processes. Carbon Dioxide in the Atmosphere Carbon dioxide is one of the primary greenhouse gases responsible for trapping heat in the Earth's ... कार्बन डाइयाक्साइड (अंग्रेज़ी: carbon dioxide; रासायनिक सूत्र CO2), एक रंगहीन तथा गन्धहीन गैस है जो पृथ्वी पर जीवन के लिये अत्यावश्यक है। धरती ... CO2 ... What does CO2 mean? Carbon Dioxide (chemical formula: CO2) is a colorless gas. It is composed of one carbon (C) and two oxygen (O) atoms. It is formed by combustion and by biological processes. People and animals release carbon dioxide when they breathe out. It is absorbed by plants in photosynthesis.