Gas produced by burning sulphur-containing fuels and as a by-product in chemical pulping Reacts with oxygen and water vapour in the air to produce sulphuric and sulphurous acids, which dissolve in rain, causing acidification of soil and water
Used to kill wild yeast's, sterilize equipment and prevent oxidation A naturally occurring substance
A colourless gas, consisting of molecules of sulphur (1) and oxygen (2) atoms, which is given off during fossil fuel combustion
sulfur dioxide: a colorless toxic gas (SO2) that occurs in the gases from volcanoes; used in many manufacturing processes and present in industrial emissions; causes acid rain