| − | The scientific definition of energy is the ability to do work.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref> | + | The scientific definition of energy is the ability to do work.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref> In physics, energy is a conserved quantity, and a closed system of interacting particles is known to always have the same value for its energy; this is known as the law of conervation of energy.<ref>Halliday, Resnick, Walker: Fundamentals of Physics, 6th Edition</ref> |