Scuba Diving International (SDI) Computer Nitrox Practice Exam

Who is responsible for creating the Nitrox used to fill scuba cylinders?

1. Diver

2. Blender

3. Technician

4. Supplier

The correct answer is: Blender

The responsibility for creating the Nitrox used to fill scuba cylinders primarily falls on the blender. A blender is the person or process that mixes the appropriate percentages of oxygen and nitrogen to create Nitrox mixtures for divers. Understanding the specific gas mixture is critical, as different blends are designed for various depths and dive profiles, affecting the diver's safety and decompression requirements. While the diver may choose the type of Nitrox they wish to use for a dive, they do not physically create the gas blend. The technician may perform maintenance on blending equipment or assist in the process, but ultimately, it is the blender who prepares the mixture. Suppliers typically provide the gases and equipment needed for blending but do not create the actual Nitrox mixtures themselves. Thus, the role of the blender is essential in ensuring that the gas is accurately prepared and safe for scuba diving applications.