- published: 10 May 2012
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Albedo (/ælˈbiːdoʊ/) or reflection coefficient, derived from Latin albedo "whiteness" (or reflected sunlight) in turn from albus "white", is the diffuse reflectivity or reflecting power of a surface.
It is the ratio of reflected radiation from the surface to incident radiation upon it. Its dimensionless nature lets it be expressed as a percentage and is measured on a scale from zero for no reflection of a perfectly black surface to 1 for perfect reflection of a white surface. NOTE: Since it is the ratio of all reflected radiation to incident radiation it will include the diffuse AND the specular radiation reflected. It is, however, common to assume a surface reflects in either a totally specular manner or a totally diffuse manner, as this can simplify calculations.
Albedo depends on the frequency of the radiation. When quoted unqualified, it usually refers to some appropriate average across the spectrum of visible light. In general, the albedo depends on the directional distribution of incident radiation, except for Lambertian surfaces, which scatter radiation in all directions according to a cosine function and therefore have an albedo that is independent of the incident distribution. In practice, a bidirectional reflectance distribution function (BRDF) may be required to accurately characterize the scattering properties of a surface, but albedo is very useful as a first approximation.
E. Estefan, Albita Y J. Marquez
Cuando la lluvia tras la ventana sea mi espera
Y me haga hermosa la sola suerte de oir tu voz
Cuando tu risa se vuelva viento en mi primavera
Habra empezado a jugar sus bromas el corazon
Si entre tus brazos falta el espacio para mi ausencia
Y acude agil al viejo estilo de verso y flor
Si te sorprendes en cada sueno con mi presencia
Es que ha llegado nuestro momento para el amor
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Cuando las rosas no sean flores sino ilusiones
Cuando la luna no sea la noche sino el adios
Cuando las aves vuelven y canten dulces canciones
Habra empezado a jugar sus bromas el corazon
Cuando te importen todas mis horas
Cuando me estranes
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Habra llegando nuestro momento para el amor
Un solo beso podemos ser
Un solo sueno
Un solo beso podemos ser
Un solo cuerpo
Un solo beso podemos ser
Un solo sueno
Un solo beso podemos ser