Digestion

Digestion:

 The process by which living organisms break down ingested food in the alimentary tract into more easily absorbed and assimilated products using enzymes and other chemicals. Digestion can occur in
aerobic conditions, where waste is decomposed by microbial action in the presence of oxygen, or anaerobic conditions, where waste is decomposed under microbial action in the absence of oxygen. In anaerobic conditions such as in a large-animal facility (i.e., dairy
farm), the by-product, a biogas, a low-energy gas that is made with the combination of methane and carbon dioxide, can be used as an energy source. In analytical chemistry, the term digestion is used to describe the process of decomposing materials and bringing them
into solution by heating with a liquid reagent, usually an acid.