periodic quantity
71Gravitational wave — In physics, a gravitational wave is a fluctuation in the curvature of spacetime which propagates as a wave, traveling outward from a moving object or system of objects. Gravitational radiation is the energy transported by these waves. Important… …
72climate — /kluy mit/, n. 1. the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years. 2. a region or… …
73star — starless, adj. /stahr/, n., adj., v., starred, starring. n. 1. any of the heavenly bodies, except the moon, appearing as fixed luminous points in the sky at night. 2. Astron. any of the large, self luminous, heavenly bodies, as the sun, Polaris,… …
74Inventario — Por inventario se define al registro documental de los bienes y demás cosas pertenecientes a una persona o comunidad, hecho con orden y precisión.[1] Por extensión, se denomina inventario a la comprobación y recuento, cuantitativo y cualitativo,… …
75petroleum refining — Introduction conversion of crude oil into useful products. History Distillation of kerosene and naphtha The refining of crude petroleum owes its origin to the successful drilling of the first oil well in Titusville, Pa., in 1859. Prior to… …
76Black hole — For other uses, see Black hole (disambiguation). Simulated view of a black hole (center) in front of the Large Magellanic Cloud. Note the gravitat …
77Chemical element — The periodic table of the chemical elements A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus.[1] Familiar examples of …
78Atom — • Primarily, the smallest particle of matter which can exist Catholic Encyclopedia. Kevin Knight. 2006. Atom Atom † …
79Alkali metal — Group → 1 ↓ Period 2 3 Li 3 …
80Maxwell's equations — For thermodynamic relations, see Maxwell relations. Electromagnetism …
