the amount of energy stored in a given system or region of space per unit volume.
See under density.
- Energy gap
noun 1. (physics) the difference of energy between the bottom of the conduction band and the top of the valence band of the electrons in a crystalline solid. For values below about 2eV the substance is considered to be a semiconductor whilst for higher values it is considered to be an insulator
noun 1. a measure of the efficiency of a heating or cooling system, as a heat pump or air conditioner, equal to the ratio of the output in B.T.U./hour to the input in watts: A high-efficiency home window air conditioner has an energy efficiency ratio of 7.5 or more. Abbreviation: EER.
noun 1. a comparative level of capacity for vigorous activity: The child has a high energy level. 2. Also called energy state. Physics. one of a quantized series of states in which matter may exist, each having constant energy and separated from others in the series by finite quantities of energy. noun (physics) 1. a […]
- Energy rating
noun a designation of the relative efficiency of an appliance, an estimate of the comparative annual energy consumption (kilowatt hours/year) of the appliance based on the tested energy consumption and information about the typical use of the appliance in the home