density variations

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• Density gradient — is a spatial variation in density over an area. The term is used in the natural sciences to describe varying density of matter, but can apply to any quantity whose density can be measured. [1] [2] Contents 1 Aerodynamics 2 …   Wikipedia

• Density of states — Condensed matter physics Phases · Phase tr …   Wikipedia

• density —    May refer to the variations perceived in the sight of objects near and far due to atmospheric variations gases, moisture, dust, smoke, and temperature as well as to seeing through such potentially translucent materials as glass and plastic.… …   Glossary of Art Terms

• Drag and Atmospheric Neutral Density Explorer — DANDE Operator University of Colorado at Boulder, Colorado Space Grant Consortium, CU Dept of Aerospace Engineering Sciences, AFRL, STP Mission type Demonstration of Concept, Neutral Density …   Wikipedia

• Calculus of variations — is a field of mathematics that deals with extremizing functionals, as opposed to ordinary calculus which deals with functions. A functional is usually a mapping from a set of functions to the real numbers. Functionals are often formed as definite …   Wikipedia

• Neutral density filter — Neutral Density Filters are often used to achieve motion blur effects with slow shutter speeds In photography and optics, a neutral density filter or ND filter can be a colorless (clear) or grey filter. An ideal neutral density filter reduces… …   Wikipedia

• Low-density polyethylene — LDPE has SPI resin ID code 4 Low density polyethylene (LDPE) is a thermoplastic made from petroleum. It was the first grade of polyethylene, produced in 1933 by Imperial Chemical Industries (ICI) using a high pressure process via free radical… …   Wikipedia

• Video High Density — (VHD) is a videodisc format which was marketed predominantly in Japan by JVC. There was also an audio only variant, Audio High Density (AHD). Technology VHD discs are 25cm (9 5/6 inches) in diameter, though the user never sees them as they are… …   Wikipedia

• Milky Way Galaxy — Large spiral galaxy (roughly 150,000 light years in diameter) that contains Earth s solar system. It includes the multitude of stars whose light is seen as the Milky Way, the irregular luminous band that encircles the sky defining the plane of… …   Universalium

• astronomy — /euh stron euh mee/, n. the science that deals with the material universe beyond the earth s atmosphere. [1175 1225; ME astronomie ( < AF) < L astronomia < Gk. See ASTRO , NOMY] * * * I Science dealing with the origin, evolution, composition,… …   Universalium

• Plate tectonics — The tectonic plates of the world were mapped in the second half of the 20th century …   Wikipedia