Definition of carbon dioxide in English:

carbon dioxide


mass noun
  • A colourless, odourless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 per cent) and is absorbed by plants in photosynthesis.

    Chemical formula: CO₂

    • ‘Partial pressures of ethylene and carbon dioxide were checked regularly during the treatments.’
    • ‘This fixed air is carbon dioxide, into which carbonates decompose when heated.’
    • ‘Thus in severe exercise we exhale more carbon dioxide than the oxygen we absorb.’
    • ‘It is the only beer in which carbon dioxide and nitrogen are present.’
    • ‘This difference makes it possible for organisms to build up carbon compounds from carbon dioxide.’
    • ‘When carbon dioxide from the air combines with rainwater, a weak carbonic acid is formed.’
    • ‘So one huge mountain of this stuff in every mine and it's absorbing carbon dioxide.’
    • ‘It also accounts for over a quarter of a million tonnes of carbon dioxide, the main greenhouse gas.’
    • ‘Because we would be producing alcohol instead of carbon dioxide and lactic acid whenever we respired.’
    • ‘Air is made up of three main types of gases: oxygen, carbon dioxide, and nitrogen.’
    • ‘For example, plants give out oxygen and animals expel carbon dioxide and methane.’
    • ‘The carbon dioxide absorbed by the rape seed plants as they grow compensates for that produced when it burns.’
    • ‘The second mechanism is keeping the already produced carbon dioxide through correct breathing.’
    • ‘It does not produce any more carbon dioxide than the methane that we already have.’
    • ‘Normally wine is protected from air during fermentation by the blanket of carbon dioxide produced.’
    • ‘A surprise inspection by the EPA found that we were releasing too much carbon dioxide into the air.’
    • ‘Using energy, mainly by burning fossil fuels, produces waste carbon dioxide.’
    • ‘If carbon dioxide is not absorbed in sufficient quantities, this will make global temperatures rise.’
    • ‘These can be used to tackle climate change by absorbing carbon dioxide, and also as a replacement for mineral oil.’
    • ‘When harmful gases like carbon dioxide are released into the atmosphere they form a dense layer around the earth.’


carbon dioxide