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

There are so many colorless gases in chemistry. Oxygen, nitrogen, methane are several examples. Colorless gases cannot be seen from our eyes. As an example, almost of all gases in the colourless gasatmosphere are colorless. Therefore, we cannot observe a color in the atmosphere. Colorless gases can be categorized to different sections.

Carbon dioxide, a colorless gas having a faint sharp odor and a sour taste. It is a greenhouse gas, but it is a minor component of Earth’s atmosphere, formed in combustion of carbon-containing materials, in fermentation, in respiration of animals, and employed by plants in the photosynthesis of carbohydrates.

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