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Carbon dioxide appears as a colorless odorless gas at atmospheric temperatures and pressures. Relativcolourless gasely nontoxic and noncombustible. Heavier than air and may asphyxiate by the displacement of air.

At room temperature carbon dioxide is a colourless and odourless gas close gas One of the three states of matter. Gases, like oxygen or helium, do not have a fixed shape and can expand to...

noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og). The noble gases are colourless, odourless, tasteless, nonflammable gases.

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