jäännösmassa

Jäännösmassa, also known as residual mass, is a concept in physics that refers to the mass of a system after all the energy associated with it has been removed. It is a fundamental concept in the theory of relativity, particularly in the context of the mass-energy equivalence principle, as described by Albert Einstein's famous equation E=mc². In this equation, E represents energy, m represents mass, and c is the speed of light in a vacuum.

The residual mass of a system is the mass that remains when all the kinetic energy, potential energy, and other forms of energy associated with the system have been converted into heat or other forms of energy that can be removed without affecting the system's gravitational field. This concept is crucial in understanding the behavior of systems in which energy and mass are interchangeable, such as in nuclear reactions and particle physics.

In practical terms, the residual mass is often used to describe the mass of a system after all the energy associated with its motion and internal structure has been dissipated. For example, in a nuclear reaction, the residual mass of the products is less than the sum of the masses of the reactants, with the difference accounted for by the energy released in the reaction.

The concept of jäännösmassa is also relevant in astrophysics, where it is used to describe the mass of stars and other celestial bodies after accounting for the energy associated with their motion and internal processes. Understanding the residual mass of these objects is essential for studying their evolution and behavior over time.