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Energy flux information


Energy flux is the rate of transfer of energy through a surface. The quantity is defined in two different ways, depending on the context:

  1. Total rate of energy transfer (not per unit area);[1] SI units: W = J⋅s−1.
  2. Specific rate of energy transfer (total normalized per unit area); [2] SI units: W⋅m−2 = J⋅m−2⋅s−1:
    • This is a vector quantity, its components being determined in terms of the normal (perpendicular) direction to the surface of measurement.
    • This is sometimes called energy flux density, to distinguish it from the first definition.
    • Radiative flux, heat flux, and sound energy flux are specific cases of this meaning.
  1. ^ "Solar Physics Glossary". Nasa. Retrieved 2008-12-24.
  2. ^ "Energy flux". Retrieved 2008-12-24.

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Energy flux

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Energy flux is the rate of transfer of energy through a surface. The quantity is defined in two different ways, depending on the context: Total rate of...

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Flux

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Luminous flux Magnetic flux Magnetic flux quantum Neutron flux Poynting flux Poynting theorem Radiant flux Rapid single flux quantum Sound energy flux Volumetric...

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Poynting vector

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Poynting vector (or Umov–Poynting vector) represents the directional energy flux (the energy transfer per unit area, per unit time) or power flow of an electromagnetic...

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Heat flux

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heat flux or thermal flux, sometimes also referred to as heat flux density, heat-flow density or heat-flow rate intensity, is a flow of energy per unit...

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Radiant flux

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radiometry, radiant flux or radiant power is the radiant energy emitted, reflected, transmitted, or received per unit time, and spectral flux or spectral power...

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Wave power

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} with P the wave energy flux per unit of wave-crest length, Hm0 the significant wave height, Te the wave energy period, ρ the water density...

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Regenerative braking

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E_{\text{braking}}} the energy flux lost while braking and E recup {\displaystyle E_{\text{recup}}} the recuperated energy flux, an equilibrium is reached...

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Greenhouse effect

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temperature. Energy flux is the rate of energy flow per unit area. Energy flux is expressed in units of W/m2, which is the number of joules of energy that pass...

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Sound power

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0°) has a sound energy flux P = 0.3 mW. This is the parameter one would be interested in when converting noise back into usable energy, along with any...

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Continuity equation

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is useful when a flux can be defined. To define flux, first there must be a quantity q which can flow or move, such as mass, energy, electric charge,...

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Exergy

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radiation can be a small fraction of the energy flux. For example, the ratio of exergy flux to energy flux ( M / H ) {\displaystyle (M/H)} for graybody...

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Radiant energy

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integrating radiant flux (or power) with respect to time. The symbol Qe is often used throughout literature to denote radiant energy ("e" for "energetic"...

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Forest ecology

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vertical structures represent large stores of potential energy that can be converted to kinetic energy under the right circumstances.[citation needed] The...

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Snowmelt

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for salt to melt the ice. There are several energy fluxes involved in the melting of snow. These fluxes can act in opposing directions, that is either...

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Geothermal energy

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are more than double humanity's current energy consumption from all primary sources, but most of this energy flux is not recoverable. In addition to the...

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Heat

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"heat flux" is used when what is meant is therefore more accurately called diffusive flux of internal energy; such usage of the term "heat flux" is a...

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Airy wave theory

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{S}}:\left(\nabla \mathbf {U} \right)=0,} with: (U + cg)E is the mean wave energy density flux, S is the radiation stress tensor and ∇U is the mean-velocity shear...

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Planetary equilibrium temperature

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planetary equilibrium temperature. The solar flux absorbed by the planet from the star is equal to the flux emitted by the planet: F a b s = F e m i t {\displaystyle...

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Spectral flux density

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In spectroscopy, spectral flux density is the quantity that describes the rate at which energy is transferred by electromagnetic radiation through a real...

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Energy current

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informal name for Energy flux. "Energy current" is a somewhat informal term that is used, on occasion, to describe the process of energy transfer in situations...

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Eddington luminosity

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{rad}}=d^{2}E/dAdt} is defined as the energy flux over a surface, which can be expressed with the momentum flux using E = p c {\displaystyle E=pc} for...

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Luminous flux

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In photometry, luminous flux or luminous power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total...

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Views of Lyndon LaRouche and the LaRouche movement

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concept energy-flux density, which is the rate of energy use per person and per unit area of the economy as a whole. He asserts that an increase in energy flux...

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Magnetic flux

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In physics, specifically electromagnetism, the magnetic flux through a surface is the surface integral of the normal component of the magnetic field B...

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