Final answer:
The SCBA component that fits over the face is known as a facepiece, which is crucial for preventing inhalation of hazardous substances and has seen advancements thanks to aerospace technology.
Step-by-step explanation:
The component of an SCBA (Self-Contained Breathing Apparatus) that fits over the face is referred to as a facepiece. This facepiece is an essential part of the breathing system, as it provides a sealed environment to prevent the inhalation of hazardous substances. Advances in technology, such as those developed by NASA, have resulted in improvements to SCBA equipment, including lightweight materials for the facepiece, as well as other components like the frame, harness, and air bottle. These technologies ensure that firefighters and others working in dangerous environments have reliable equipment that can protect them from smoke inhalation and other respiratory hazards.