The most important use of oxygen is in respiration. Oxygen is of great importance in the chemical and the iron and steel industries.Its other major use is in steel production â¦ , for example in the Bessemer process. The oxyacetylene torch is another important industrial application.ts other major use is in steel production, for example in the Bessemer process. The oxyacetylene torch is another important industrial application. Oxygen is utilized in medicine in the treatment of respiratory diseases and is mixed with other gases for respiration in submarines, high-flying aircraft, and spacecraft.
Ireland is known as the Emerald Isle. Green is traditionally worn on St. Patrick's day to honor the Emerald Isle. Tradition holds that on that day, people who do not wear green are pinched as a reminder to wear green to honor the Emerald Isle.
Badge of the Order of St Patrick. St. Patrick's blue is a name applied to several shades of blue associated with Saint Patrick and Ireland. The colour blue's association with Saint Patrick dates from the 1780s, when it was adopted as the colour of the Anglo-Irish  Order of St. Patrick . In British usage, it refers to a sky blue used by the Order of St. Patrick, whereas in Irish usage it is often a dark, rich blue.