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Coherent System
A coherent system of units is a system of units of measurement used to express physical quantities that are defined in such a way that the equations relating the numerical values expressed in the units of the system have exactly the same form, including numerical factors, as the corresponding equations directly relating the quantities. It is a system in which every quantity has a unique unit, or one that does not use conversion factors. A coherent derived unit is a SI derived unit, derived unit that, for a given system of quantities and for a chosen set of Base unit (measurement), base units, is a product of powers of base units, with the proportionality factor being one. If a system of quantities has equations that relate quantities and the associated system of units has corresponding base units, with only one unit for each base quantity, then it is coherent if and only if every derived unit of the system is coherent. The concept of coherence was developed in the mid-nineteenth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Clerk Maxwell
James Clerk Maxwell (13 June 1831 – 5 November 1879) was a Scottish physicist and mathematician who was responsible for the classical theory of electromagnetic radiation, which was the first theory to describe electricity, magnetism and light as different manifestations of the same phenomenon. Maxwell's equations for electromagnetism achieved the Unification (physics)#Unification of magnetism, electricity, light and related radiation, second great unification in physics, where Unification (physics)#Unification of gravity and astronomy, the first one had been realised by Isaac Newton. Maxwell was also key in the creation of statistical mechanics. With the publication of "A Dynamical Theory of the Electromagnetic Field" in 1865, Maxwell demonstrated that electric force, electric and magnetic fields travel through space as waves moving at the speed of light. He proposed that light is an undulation in the same medium that is the cause of electric and magnetic phenomena. (Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancient China
The history of China spans several millennia across a wide geographical area. Each region now considered part of the Chinese world has experienced periods of unity, fracture, prosperity, and strife. Chinese civilization first emerged in the Yellow River valley, which along with the Yangtze River, Yangtze basin constitutes the geographic core of the Sinosphere, Chinese cultural sphere. China maintains a rich diversity of ethnic and linguistic people groups. The Chinese historiography, traditional lens for viewing Chinese history is the Dynasties of China, dynastic cycle: imperial dynasties rise and fall, and are ascribed certain achievements. This lens also tends to assume Chinese civilization can be traced as an unbroken thread Five thousand years of Chinese civilization, many thousands of years into the past, making it one of the Cradle of civilization, cradles of civilization. At various times, states representative of a dominant Chinese culture have directly controlled areas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Finger (unit)
A finger (sometimes fingerbreadth or finger's breadth) is any of several units of measurement that are approximately the width of an adult human finger. xactly which part of the finger should be used is not defined; the width at the base of fingernail (#6 in the sketch) is typically less than that at the knuckle (#5). The digit, also known as digitus or digitus transversus (Latin), dactyl (Greek) or dactylus, or finger's breadth of an inch or of a foot. (about 2 cm) In medicine Medicine is the science and Praxis (process), practice of caring for patients, managing the Medical diagnosis, diagnosis, prognosis, Preventive medicine, prevention, therapy, treatment, Palliative care, palliation of their injury or disease, ... and related disciplines (anatomy, radiology, etc.) the fingerbreadth (literally the width of a finger) is an informal but widely used unit of measure. In the measurement of distilled spirits, a finger of whiskey refers to the amount of whiskey that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barley
Barley (), a member of the grass family, is a major cereal grain grown in temperate climates globally. It was one of the first cultivated grains; it was domesticated in the Fertile Crescent around 9000 BC, giving it nonshattering spikelets and making it much easier to harvest. Its use then spread throughout Eurasia by 2000 BC. Barley prefers relatively low temperatures and well-drained soil to grow. It is relatively tolerant of drought and soil salinity, but is less winter-hardy than wheat or rye. In 2023, barley was fourth among grains in quantity produced, 146 million tonnes, behind maize, rice, and wheat. Globally, 70% of barley production is used as animal feed, while 30% is used as a source of fermentable material for beer, or further distilled into whisky, and as a component of various foods. It is used in soups and stews and in barley bread of various cultures. Barley grains are commonly made into malt using a traditional and ancient method of preparatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naram-Sin Of Akkad
Naram-Sin, also transcribed Narām-Sîn or Naram-Suen (: '' DNa-ra-am D Sîn'', meaning "Beloved of the Moon God Sîn", the "𒀭" a determinative marking the name of a god; died 2218 BC), was a ruler of the Akkadian Empire, who reigned –2218 BC ( middle chronology), and was the third successor and grandson of King Sargon of Akkad. Under Naram-Sin the empire reached its maximum extent. He was the first Mesopotamian king known to have claimed divinity for himself, taking the title "God of Akkad", and the first to claim the title " King of the Four Quarters". His military strength was strong as he crushed revolts and expanded the empire to places like Turkey and Iran. He became the patron city god of Akkade as Enlil was in Nippur. His enduring fame resulted in later rulers, Naram-Sin of Eshnunna and Naram-Sin of Assyria as well as Naram-Sin of Uruk, assuming the name. Biography Naram-Sin was a son of Manishtushu. He was thus a nephew of King Rimush and grandson of Sarg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akkadian Empire
The Akkadian Empire () was the first known empire, succeeding the long-lived city-states of Sumer. Centered on the city of Akkad (city), Akkad ( or ) and its surrounding region, the empire united Akkadian language, Akkadian and Sumerian language, Sumerian speakers under one rule and exercised significant influence across Mesopotamia, the Levant, and Anatolia, sending military expeditions as far south as Dilmun and Magan (civilization), Magan (modern United Arab Emirates, Saudi Arabia, Bahrain, Qatar and Oman) in the Arabian Peninsula.Mish, Frederick C., Editor in Chief. "Akkad" ''iarchive:webstersninthne000merr, Webster's Ninth New Collegiate Dictionary''. ninth ed. Springfield, MA: Merriam-Webster 1985. ). The Akkadian Empire reached its political peak between the 24th and 22nd centuries BC, following the conquests by its founder Sargon of Akkad. Under Sargon and his successors, the Akkadian language was briefly imposed on neighboring conquered states such as Elam and Guti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Philosophical Society
The American Philosophical Society (APS) is an American scholarly organization and learned society founded in 1743 in Philadelphia that promotes knowledge in the humanities and natural sciences through research, professional meetings, publications, source text, library resources, and community outreach. It was founded by the polymath Benjamin Franklin and is considered the first learned society founded in what became the United States.Philosophical Hall, the society's headquarters and a museum, is located just east of Independence Hall in Independence National Historical Park. In 1965, in recognition of the building's history, it was designated a National Historic Landmark. The society has about 1,000 elected members. As of April 2020, 5,710 members had been inducted since its creation. Through research grants, published journals, the American Philosophical Society Museum, an extensive library, and regular meetings, the society supports a variety of disciplines in the humanitie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hand (unit)
The hand is a non-SI unit of measurement of length standardized to . It is used to measure the height of horses in many English-speaking countries, including Australia, Canada, Republic of Ireland, Ireland, the United Kingdom, and the United States. It was originally based on the breadth of a human hand. The adoption of the Inch#Equivalents, international inch in 1959 allowed for a standardized Imperial and US customary measurement systems#Units of length, imperial form and a Metric system, metric conversion. It may be abbreviated to "h" or "hh". Although measurements between whole hands are usually expressed in what appears to be decimal format, the subdivision of the hand is not decimal but is in radix, base 4, so subdivisions after the radix point are in quarters of a hand, which are inches. Thus, 62 inches is fifteen and a half hands, or 15.2 hh (normally said as "fifteen-two", or occasionally in full as "fifteen hands two inches"). Terminology "Hands" may be abbrevia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancient Egyptian Units Of Measurement
The ancient Egyptian units of measurement are those used by the dynasties of ancient Egypt prior to its incorporation in the Roman Empire and general adoption of Roman, Greek, and Byzantine units of measurement. The units of length seem to have originally been anthropic, based on various parts of the human body, although these were standardized using cubit rods, strands of rope, and official measures maintained at some temples. Following Alexander the Great's conquest of Persia and subsequent death, his bodyguard and successor Ptolemy assumed control in Egypt, partially reforming its measurements, introducing some new units and hellenized names for others. Length Egyptian units of length are attested from the Early Dynastic Period. Although it dates to the 5th dynasty, the Palermo stone recorded the level of the Nile River during the reign of the Early Dynastic pharaoh Djer, when the height of the Nile was recorded as 6 cubits and 1 palm (about ). A Third Dynasty diagram sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biblical And Talmudic Units Of Measurement
Biblical and Talmudic units of measurement were used primarily by ancient Israelites and appear frequently within the Hebrew Bible as well as in later rabbinic writings, such as the Mishnah and Talmud. These units of measurement continue to be used in functions regulating Orthodox Jewish contemporary life, based on halacha. The specificity of some of the units used and which are encompassed under these systems of measurement (whether in linear distance, weight or volume of capacity) have given rise, in some instances, to disputes, owing to the discontinuation of their Hebrew names and their replacement by other names in modern usage. Note: The listed measurements of this system range from the lowest to highest acceptable halakhic value, in terms of conversion to and from contemporary systems of measurement. Unit conversion Archaeological While documentation on each unit's relation to another's is plentiful, there is much debate, both within Judaism and in Jewish studies, academia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of Measurement Systems In India
The history of measurement systems in India begins in early Indus Valley civilisation with the earliest surviving samples dated to the 3rd millennium BCE.Iwata, 2254 Since early times the adoption of standard weights and measures has reflected in the country's Indian architecture, architectural, Folk culture, folk, and History of metallurgy in the Indian subcontinent, metallurgical artifacts. A complex system of weights and measures was adopted by the Maurya empire (322–185 BCE), which also formulated regulations for the usage of this system. Later, the Mughal empire (1526–1857) used standard measures to determine land holdings and collect land tax as a part of Mughal land reforms. The formal metrication in India is dated to 1 October 1958 when the Indian Government adopted the International System of Units, International System of Units (SI). Early history Standard weights and measures were developed by the Indus Valley Civilization. The centralised weight and me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancient Mesopotamian Units Of Measurement
Ancient Mesopotamian units of measurement originated in the loosely organized city-states of Early Dynastic Sumer. Each city, kingdom and trade guild had its own standards until the formation of the Akkadian Empire when Sargon of Akkad issued a common standard. This standard was improved by Naram-Sin, but fell into disuse after the Akkadian Empire dissolved. The standard of Naram-Sin was readopted in the Ur III period by the Nanše Hymn which reduced a plethora of multiple standards to a few agreed upon common groupings. Successors to Sumerian civilization including the Babylonians, Assyrians, and Persians continued to use these groupings. Akkado-Sumerian metrology has been reconstructed by applying statistical methods to compare Sumerian architecture, architectural plans, and issued official standards such as Statue B of Gudea and the bronze cubit of Nippur. Archaic system The systems that would later become the classical standard for Mesopotamia were developed in p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
