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.
Inorganic Chemistry is the study of the properties and reactions of all chemical elements and compounds other than hydrocarbons or their derivatives. Materials Chemistry is an interdisciplinary field involving the properties of solid matter and its applications to various areas of science and engineering.