The volume of a unit weight of a substance at a specific temperature and pressure.
The written or printed direction regarding the details of a building or other construction not included in the set of working drawings.
The products and the plans for construction of a building.
Spectral energy efficiency distribution
A curve illustrating the variation or spectral irradiance with wavelength.
The monochromatic irradiance of a surface per unit bandwidth at a particular wavelength, usually expressed in Watts per square meter-nanometer bandwidth.
Spectral power distribution (spd)
A graph of the radiant power emitted by a light source as a function of wavelength. SPD's provide a visual profile or "finger print" of the color characteristics of the source throughout the visible part of the spectrum.
The ratio of energy reflected from a surface in a given waveband to the energy incident in that waveband.
Spectrally selective coatings
A type of window glazing films used to block the infrared (heat) portion of the solar spectrum but admit a higher portion of visible light.
Smooth, high-gloss finish.
Reflection, without diffusion, in accordance with the laws of geometrical optics; as in a mirror.