a crop that is grown because it can be used as fuel
noun 1. a drink intended to boost mental energy, typically containing sugar and caffeine or other stimulants. noun 1. a soft drink containing ingredients designed to boost the drinker’s energy, esp after exercise noun a soft drink offering metabolic stimulation through B-complex vitamins and central nervous system stimulation through caffeine, esp. for athletes, etc.; see […]
noun 1. the amount of energy stored in a given system or region of space per unit volume. energy density 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.