Final answer:
To deliver oxygen to patients at a safe pressure, an oxygen mask, oxygen tank, oxygen regulator, and oxygen concentrator are necessary.
Step-by-step explanation:
To deliver oxygen to patients at a safe pressure, several components are necessary. One of these components is the oxygen mask, which is used to deliver the oxygen to the patient's nose and mouth. Another important component is the oxygen tank, which contains the compressed oxygen. To regulate the pressure of the oxygen, an oxygen regulator is required. Finally, an oxygen concentrator may be used to extract oxygen from the surrounding air.