What equipment is used to extract oxygen from the air?

The correct answer is the oxygen concentrator, which is specifically designed to extract oxygen from the surrounding air. It works by drawing in ambient air, filtering out nitrogen, and delivering a higher concentration of oxygen to the user. This is particularly useful in medical settings for patients who require supplemental oxygen due to respiratory conditions.

Oxygen concentrators are advantageous because they do not require large tanks of oxygen, making them more convenient and sustainable for long-term use. They also continuously provide oxygen as long as there is sufficient power supply and air, allowing patients to maintain their mobility and independence.

In contrast, a ventilator is used to assist or control a patient's breathing, a nebulizer is utilized for delivering medication in the form of mist to the lungs, typically for conditions like asthma, and a blood oxygen monitor is a device that measures the level of oxygen in the blood but does not have any role in extracting oxygen from the air. Thus, the oxygen concentrator stands out as the equipment designed specifically for extracting and concentrating oxygen from the environment.