Definition of brightness

At the behest of physics, brightness corresponds to the quantity of emitted luminous flux. This luminosity is related to the number of particles per unit area and also per unit of time that have been in a beam of light. In the field of astronomy, the brightness will be the amount of power emitted in all directions by a celestial body. Meanwhile, brightness will depend on the absolute magnitude that present the star; the value is not constant in a really long time, because it is common that the star go changing its brightness depending on the State in which it is located. Also, in this context, we find the surface shine, that will be that apparent brightness that boast extensive astronomical objects, such as galaxies and universes.
On the other hand, when it comes to brightness, you may be making reference to the physical property that describes the way light interacts with the surface of a rock, mineral and therefore is able to reflect on it. This brightness will depend on three factors: the absorption that the ore has each color, the perfect polishing on the faces and the refractive index of the mineral in question.
In this sense, there are three types of glitters: metallic Sheen (produced by opaque substances), non-metallic brightness (transparent substances produce it) and submetalico brightness (which hold the opaque substances when they are thick, but that in the case of exfoliate fine blades will be transparent).
In photometry, the brightness will be light intensity emitted a screen. In the case of televisions, one has the possibility, through a menu offering appliances, increase or decrease the brightness according to personal needs.
And finally in the common language used the term gloss to account for the brilliance of someone, an artist, an intellectual, for example, that inspires admiration.