Positive feedback is termed as the process which appears in a feedback loop whereby small disturbance on a system may leads to increase in magnitude.
There is exponential growth when the side of equilibrium increases in oscillation. Positive feedback is used in digital electronics which moves voltage away from intermediate voltage.
Another example of positive feedback is thermal runaway and its work is to destroy semiconductor junctions. In chemical reaction the work of positive feedback is to increase the rate of reaction.
There are two types of feedback mechanisms Positive feedback heightens the intensity Negative feedback lowers the intensity
These all serve to maintain homeostasis. Homeostasis is the state where the internal and external part of the body maintains and establishes balance and equilibrium. </span>
The changes in the grape juice happened due to the alcoholic fermentation of the grape juice that occurs due to the presence of aerobic bacteria. The presence of yeast is the main reason behind the process of fermentation taking place. The froth is produced due to the presence of the formation of acid and carbon dioxide.
