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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.

From green to pink hydrogen, we reveal the rainbow of hydrogen colours and the different types of technology used to produce each. Why is a colourless gas given so many colourful terms? Green hydrogen, blue hydrogen, brown hydrogen and even。

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 atmosphere are colorless. Therefore, we cannot observe a color in the atmosphere. Colorless gases can be categorized to different sections.

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