Which component of SCBA is responsible for providing a user with a direct source of breathable air?

The air cylinder is the component of the Self-Contained Breathing Apparatus (SCBA) that provides a direct source of breathable air to the user. It is a high-pressure tank that stores compressed air, allowing firefighters or other first responders to breathe safely in environments that are immediately dangerous to life or health. The air within the cylinder is specifically treated and filtered to ensure that it is safe for inhalation.

The cylinder works in conjunction with other components, such as the pressure regulator, which controls the flow of air from the cylinder to the user, ensuring it is delivered at a manageable pressure. However, the air cylinder itself is the source of breathable air, making it the vital component responsible for supplying the necessary air to the user during their operation.