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.
chemistry. 1  the science that deals with the composition and properties of substances and various elementary forms of matter. 2  chemical properties, reactions, phenomena, etc.: the chemistry of carbon. 3  the interaction of one personality with another: The chemistry between him and his boss was all wrong.