A woman wearing an<unk>  An<unk>  provides a method to transfer breathing oxygen gas from a storage tank to the lungs.<unk> s may cover only the nose and mouth (oral nasal<unk>  or the entire face (full-face<unk> . They may be made of plastic, silicone, or rubber. In certain circumstances, oxygen may be delivered via a nasal cannula instead of a<unk> .
Oxygen mask
Gas mask
Oxygen tent
Venturi mask
N95 respirator
Nicotine nasal spray
Nasal cannula
Pocket mask