Also found in: Thesaurus, Medical, Legal, Encyclopedia, Wikipedia.
1. A thermodynamic quantity that is the difference between the internal energy of a system and the product of its absolute temperature and entropy; the capacity of a system to do work, as in an exothermic chemical reaction.
2. A thermodynamic quantity that is the difference between the enthalpy and the product of the absolute temperature and entropy of a system. Also called Gibbs free energy.
Switch to new thesaurus
|Noun||1.||free energy - (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs; "energy can take a wide variety of forms"|
natural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics"
physical phenomenon - a natural phenomenon involving the physical properties of matter and energy
activation energy, energy of activation - the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur; "catalysts are said to reduce the energy of activation during the transition phase of a reaction"
alternative energy - energy derived from sources that do not use up natural resources or harm the environment
binding energy, separation energy - the energy required to separate particles from a molecule or atom or nucleus; equals the mass defect
chemical energy - that part of the energy in a substance that can be released by a chemical reaction
electrical energy, electricity - energy made available by the flow of electric charge through a conductor; "they built a car that runs on electricity"
energy level, energy state - a definite stable energy that a physical system can have; used especially of the state of electrons in atoms or molecules; "according to quantum theory only certain energy levels are possible"
rest energy - the energy equivalent to the mass of a particle at rest in an inertial frame of reference; equal to the rest mass times the square of the speed of light
work - (physics) a manifestation of energy; the transfer of energy from one physical system to another expressed as the product of a force and the distance through which it moves a body in the direction of that force; "work equals force times distance"
mechanical energy - energy in a mechanical form
radiant energy - energy that is transmitted in the form of (electromagnetic) radiation; energy that exists in the absence of matter
radiation - energy that is radiated or transmitted in the form of rays or waves or particles