![]() Gravimetric energy density can also be referred to as specific energy. Gravimetric energy density - how much energy a system contains in comparison to its mass typically expressed in watt-hours per kilogram (Wh/kg), or Megajoules per kilogram (MJ/kg).Volumetric energy density - how much energy a system contains in comparison to its volume typically expressed in watt-hours per liter (Wh/L) or Megajoules per liter (MJ/L).Įnergy density is generally expressed in two ways, although the first is more common: In scientific equations, energy density is often denoted by U. When calculating the amount of energy in a system most often only useful or extractable energy is measured. These reactions are nuclear, chemical, electrochemical and electrical. Ī material can release energy in four types of reactions. The higher the energy density of a system or material, the greater the amount of energy it has stored. Energy density can be measured in energy per volume or per mass. Įnergy density is the amount of energy that can be stored in a given system, substance, or region of space. An XKCD comic showing the comparative energy density of Uranium. Rochester (NY): University of Rochester Medical Center c2020. ![]() University of Rochester Medical Center.Gainesville (FL): University of Florida Health c2020. UF Health: University of Florida Health.Department of Health and Human Services Bone Mass Measurement: What the Numbers Mean. NIH Osteoporosis and Related Bone Diseases National Resource Center.Department of Health and Human Services Get a Bone Density Test. Mayo Foundation for Medical Education and Research c1998–2020. Washington D.C.: American Association for Clinical Chemistry c2001–2020. Learn more about laboratory tests, reference ranges, and understanding results. ![]() If you have questions about your results and/or treatments for bone loss, talk to your health care provider.
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