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, energy is an indirectly observed quantity which comes in many forms, such as kinetic energy, poten

In the context of physical sciences, several forms of energy have been defined. These include[need quotation to verify]:

Thermal energy
Chemical energy
Electric energy
Radiant energy, the energy of electromagnetic radiation
Nuclear energy
Magnetic energy
Elastic energy
Sound energy
Mechanical energy
Luminous energy
Mass (E=mc²)
These forms of energy may be divided into two main groups; kinetic en  ...