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2 天前 · List of chemical elements. 118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z ). [1]
18 小時前 · This is a list of the most populous incorporated places of the United States.As defined by the United States Census Bureau, an incorporated place includes cities, towns, villages, boroughs, and municipalities. A few exceptional census-designated places (CDPs) are also included in the Census Bureau's listing of incorporated places. ...
5 天前 · ISO 3166-1 ( Codes for the representation of names of countries and their subdivisions – Part 1: Country codes) is a standard defining codes for the names of countries, dependent territories, and special areas of geographical interest. It is the first part of the ISO 3166 standard published by the International Organization for Standardization .
1 天前 · J. Robert Oppenheimer (born Julius Robert Oppenheimer; / ˈɒpənhaɪmər / OP-ən-hy-mər; April 22, 1904 – February 18, 1967) was an American theoretical physicist. He was director of the Manhattan Project 's Los Alamos Laboratory during World War II and is often called the "father of the atomic bomb ". Born in New York City, Oppenheimer ...
1 天前 · Nazi Germany, [h] officially known as the German Reich [i] and later the Greater German Reich, [j] is a term used to describe the German state between 1933 and 1945, when Adolf Hitler and the Nazi Party controlled the country, transforming it into a totalitarian dictatorship. The Third Reich, [k] meaning "Third Realm" or "Third Empire ...
18 小時前 · Elephant. Elephants are the largest living land animals. Three living species are currently recognised: the African bush elephant ( Loxodonta africana ), the African forest elephant ( L. cyclotis ), and the Asian elephant ( Elephas maximus ). They are the only surviving members of the family Elephantidae and the order Proboscidea; extinct ...
1 天前 · t. e. The viscosity of a fluid is a measure of its resistance to deformation at a given rate. [1] For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. [2] Viscosity is defined scientifically as a force multiplied by a time divided by an area.
