We all know that oxygen is colorless, odorless, invisible and untouchable. But why the hospital oxygen cylinder respirator (a whole set on the patient's nose)

This flavor should not be the taste of medical oxygen, it should be the taste of breathing masks or breathing tubes (general breathing masks, breathing tubes, intubation), and other indeed the material is silicone rubber, in the processing of these products will add some additives, such as like the essence of the so there is generally an aromatic flavor.