DefinitionIntegrals are mathematical tools to evaluate those quantities like area, volume, mass and other quantity which is related to physical property. They are used to find the area between curves, to find the volume of solids of revolution, to find the center of mass, to find the work done by a force, to find probabilities in statistics, and many, many more applications. Integrals are found in many scientific fields all-around, like physics, engineering, and so on. In physics, for example, one would integrate the power function to get the total energy stored in a system with respect to time.