a standard, model, or pattern. 2. general level or average: Two cars per family is the norm in most suburban communities. 3. Education. a designated standard of average performance of people of a given age, background, etc. a standard based on the past average performance of a given individual.
For example, pressure regulators are used in gas grills to regulate propane, in home heating furnaces to regulate natural gases, in medical and dental equipment to regulate oxygen and anesthesia gases, in pneumatic automation systems to regulate compressed air, in engines to regulate fuel and in fuel cells to regulate hydrogen.
Scuba Diving Regulators. The keystone of the diving experience, the scuba regulator is the interface between man and tank that supplies the diver with air at ambient pressure. The first stage of a regulator attaches directly to the tank, reducing the pressure of the air leaving the tank by a preset amount.