black-body radiation
121Wien , Wilhelm Carl Werner Otto Fritz Franz — (1864–1928) German physicist The son of a farmer from Gaffken in Eastern Europe, Wien studied mathematics and physics for a brief period in 1882 at the University of Göttingen. Having recommenced his studies in 1884 at the University of Berlin,… …
122Debye model — Statistical mechanics Thermodynamics · …
123Thermodynamic system — A thermodynamic system is a precisely defined macroscopic region of the universe, often called a physical system, that is studied using the principles of thermodynamics. All space in the universe outside the thermodynamic system is known as the… …
124Passive infrared sensor — A Passive InfraRed sensor (PIR sensor) is an electronic device that measures infrared (IR) light radiating from objects in its field of view. PIR sensors are often used in the construction of PIR based motion detectors (see below). Apparent… …
125Otto Lummer — Otto Richard Lummer (1860 1925) was a German physicist and researcher.[1] He was born in the city of Gera, Germany. With Leon Arons, Lummer helped to design and build the Arons Lummer mercury vapor lamp.[2] Lummer primarily worked in the field of …
126Meteorology — For other uses of the root word meteor , see Meteor (disambiguation). For the work by Aristotle, see Meteorology (Aristotle). Not to be confused with Metrology. Part of the Nature series on Weather   …
127Joseph Stefan — Infobox Scientist box width = 300px name = Joseph Stefan image size = 250px caption = Jožef Stefan (1835 1893) birth date = birth date|1835|3|24|df=y birth place = St Peter near Klagenfurt, Austrian Empire death date = death date and… …
128Phonon — For KDE Software Compilation 4 s multimedia framework, see Phonon (KDE). Normal modes of vibration progression through a crystal. The amplitude of the motion has been exaggerated for ease of viewing; in an actual crystal, it is typically much… …
