Air tanks are an essential part of breathing apparatus. They are also known as oxygen tanks, air bottles, and air cylinders. These synonyms describe the purpose of the tanks as a source of breathable air in emergency situations. Similarly, scuba divers use air tanks, known as scuba cylinders or diving tanks, to breathe underwater. Another synonym is compressed air cylinder, which is often used in industrial settings for pneumatic tools. In medical settings, air tanks may be referred to as oxygen cylinders or medical gas cylinders. Regardless of the terminology, air tanks play a crucial role in providing breathable air for life support and other applications.