I
Capacity for doing work .
Energy exists in various forms
including kinetic , potential , thermal , electricity ), and nuclear
and can be converted from one form to another. For example, fuel-burning heat engines convert chemical energy to thermal energy; batteries convert chemical energy to electrical energy. Though energy may be converted from one form to another, it may not be created or destroyed; that is, total energy in a closed system remains constant. All forms of energy are associated with motion . A rolling ball has kinetic energy, for instance, whereas a ball lifted above the ground has potential energy, as it has the potential to move if released. Heat and work involve the transfer of energy; heat transferred may become thermal energy. See also activation energy , binding energy , ionization energy , mechanical energy , solar energy , zero-point energy .
II
[c mediumvioletred] (as used in expressions)
activation energy
alternative energy
binding energy
chemical energy
Einstein's mass energy relation
energy conservation of
energy equipartition of
European Atomic Energy Community Euratom
free energy
geothermal energy
International Atomic Energy Agency
ionization energy
kinetic energy
mechanical energy
nuclear energy
atomic energy
high energy physics
potential energy
solar energy
thermal energy
{{link=zero point energy">zero point energy