Dimensional analysis is a mathematical technique used to study various physical phenomena. It mainly involves the use of units and conversion factors to determine the dimensions of a given quantity. Synonyms for the term include unit analysis, dimensional reasoning, and quantity calculus. All these expressions refer to the same concept of analyzing quantities in terms of their dimensions and units. Dimensional analysis is particularly useful in physics, engineering, and chemistry, where it is used to check that equations are physically meaningful and to convert units in calculations. This ensures that the answers obtained are correct and that the dimensions of the quantities are consistent.