When the computer receives a rich signal (high voltage) from the O2 sensor, it leans the fuel mixture to reduce the sensor's reading. When the O2 sensor reading goes lean (low voltage), the computer reverses again making the fuel mixture go rich.
Chemistry and physics are branches of science that both study matter. The difference between the two lies in their scope and approach. Chemists and physicists are trained differently, and they have different professional roles, even when working in a team.
Recall from Chapter 1 that chemistry is the study of matter, and matter is. anything that has mass and takes up space. Everything around you is mat-. ter; including things such as air and microbes, which you cannot see. For. example, table salt is a simple type of matter that you are probably familiar. with.