| NOUN | phenomenon | free energy, energy | (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work |
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| Meaning | (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs. | |
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| Synonym | energy | |
| Category | physics, natural philosophy | The science of matter and energy and their interactions |
| Narrower | activation energy, energy of activation | The energy that an atomic system must acquire before a process (such as an emission or reaction) can occur |
| alternative energy | energy derived from sources that do not use up natural resources or harm the environment | |
| atomic energy, nuclear energy | The energy released by a nuclear reaction | |
| binding energy, separation energy | The energy required to separate particles from a molecule or atom or nucleus | |
| chemical energy | That part of the energy in a substance that can be released by a chemical reaction | |
| electricity, electrical energy, power | Energy made available by the flow of electric charge through a conductor | |
| energy level, energy state | A definite stable energy that a physical system can have | |
| heat, heat energy | A form of energy that is transferred by a difference in temperature | |
| mechanical energy | Energy in a mechanical form | |
| radiant energy | Energy that is transmitted in the form of (electromagnetic) radiation | |
| radiation | Energy that is radiated or transmitted in the form of rays / rays or waves or particles | |
| rest energy | The energy equivalent to the mass of a particle at rest in an inertial frame of reference | |
| work | (physics) a manifestation of energy | |
| Broader | physical phenomenon | A natural phenomenon involving the physical properties of matter and energy |
| Spanish | energía | |
| Catalan | energia | |
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