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Surface energy print that page


For a liquid, the surface tension (force per unit length) and the surface energy density are identical. Water has a surface energy density of 0.072 J/m 2 and a surface tension of 0.072 N/m. Cutting a solid body into pieces disrupts its bonds, and therefore consumes energy . If the cutting

Specific surface energy print that page

Specific surface energy From Wikipedia, the free encyclopedia Jump to: navigation , search specific surface energy , also known as surface free energy , is the amount of increase of free energy when the area of surface increases by every unit area. It can be calculated using

wikipedia.org | 2011/5/16 2:14:11

Potential energy print that page


In physics , potential energy is the energy stored in a body or in a system due to its position in a force field or due to its configuration. [ 1 ] The SI unit of measure for energy and work is the Joule (symbol J). The term "potential energy " was coined by the 19th century Scottish

Pumped-storage hydroelectricity print that page


from the exposed water surface and conversion losses, approximately 70% to 85% of the electrical energy used to pump the water into the elevated reservoir can be regained. [ 1 ] The technique is currently the most cost-effective means of storing large amounts of electrical energy on an operating

Specific orbital energy print that page

In the gravitational two-body problem , the specific orbital energy (or vis-viva energy ) of two orbiting bodies is the constant sum of their mutual potential energy ( ) and their total kinetic energy ( ), divided by the reduced mass . According to the orbital energy conservation

wikipedia.org | 2011/6/7 4:47:18

Solar thermal energy print that page


ventilation , and air conditioning ( HVAC ) systems account for over 25 percent (4.75 EJ) of the energy used in commercial buildings and nearly half (10.1 EJ) of the energy used in residential buildings. [ 4 ] [ 5 ] Solar heating, cooling, and ventilation technologies can be used to offset

Fermi energy print that page

The Fermi energy is a concept in quantum mechanics usually referring to the energy of the highest occupied quantum state in a system of fermions at absolute zero temperature . Confusingly, the term "Fermi energy " is often used to describe a different but closely-related concept, the

wikipedia.org | 2011/7/17 21:15:23

Ocean thermal energy conversion print that page


that OTEC offers the greatest possibilities. OTEC has the potential to offer global amounts of energy that are 10 to 100 times greater than other ocean energy options such as wave power [ citation needed ] . OTEC plants can operate continuously providing a base load supply for an electrical

Gibbs free energy print that page

In thermodynamics , the Gibbs free energy ( IUPAC recommended name: Gibbs energy or Gibbs function ; also known as free enthalpy [ 1 ] to distinguish it from Helmholtz free energy ) is a thermodynamic potential that measures the "useful" or process-initiating work obtainable from a

wikipedia.org | 2011/8/8 5:31:20

Surface tension print that page


Surface tension has the dimension of force per unit length , or of energy per unit area . The two are equivalent—but when referring to energy per unit of area, people use the term surface energy —which is a more general term in the sense that it applies also to solids and not just