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In physics, energy density is the quotient between the amount of energy stored in a given system or contained in a given region of space and the volume of the system or region considered. Often only the useful or extractable energy is measured. It is sometimes confused with stored energy per unit mass, which is called specific energy or ...
Specific energy or massic energy is energy per unit mass. It is also sometimes called gravimetric energy density, which is not to be confused with energy density, which is defined as energy per unit volume. It is used to quantify, for example, stored heat and other thermodynamic properties of substances such as specific internal energy ...
Energy densities table. Storage type. Specific energy (MJ /kg) Energy density (MJ/ L) Peak recovery efficiency %. Practical recovery efficiency %. Arbitrary Antimatter. 89,875,517,874. depends on density.
A Ragone plot (/ rəˈɡoʊniː / rə-GOH-nee) [1] is a plot used for comparing the energy density of various energy-storing devices. On such a chart the values of specific energy (in W·h / kg) are plotted versus specific power (in W/kg). Both axes are logarithmic, which allows comparing performance of very different devices.
Nickel–metal hydride. 66. 300–800 [13] Low self-discharge nickel–metal hydride battery. 500–1,500 [13] Lithium cobalt oxide. 90. 500–1,000. Lithium–titanate.
The energy content of biofuel is the chemical energy contained in a given biofuel, measured per unit mass of that fuel, as specific energy, or per unit of volume of the fuel, as energy density. A biofuel is a fuel produced from recently living organisms. Biofuels include bioethanol, an alcohol made by fermentation —often used as a gasoline ...
Gravimetric energy density (specific energy) 75–200 W·h/kg, based on prototypes and product announcements [ 56 ] [ 59 ] [ 60 ] Low end for aqueous, high end for carbon batteries [ 51 ] 120–260 W·h/kg (without protective case needed for battery pack in vehicle) [ 57 ]
The watt-hour per kilogram (SI symbol: W⋅h/kg) is a unit of specific energy commonly used to measure the density of energy in batteries and capacitors. SI Units [ edit ]