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

Sulfur dioxide, SO2, is a colourless gas or liquid that has a strong, odorous smell. It is derived from the burning of fossil fuels (coal and oil) and the smelting of sulphur-containing mineral ores (aluminium, copper, zinc, lead and iron).

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。

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