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Pierre Prevost (physicist)
Pierre Prevost (; 3 March 1751 – 8 April 1839) was a Genevan philosopher and physicist. In 1791 he explained Pictet's experiment by arguing that all bodies radiate heat, no matter how hot or cold they are. Life Son of a Protestant clergyman in Geneva in the Republic of Geneva, he was born in that city and was educated for a clerical career. However, he abandoned it for law, and this too he quickly deserted to devote himself to education and to travelling. He became close friends with Jean Jacques Rousseau and, a little later, with Dugald Stewart, having previously distinguished himself as a translator of and commentator on Euripides. Frederick II of Prussia secured him in 1780 as professor of philosophy and made him member of the Akademie der Wissenschaften in Berlin. He there became acquainted with Joseph Louis Lagrange and was thus led to turn his attention to physical science. After some years spent on political economy and on the principles of the fine arts (in conn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physicist Pierre Prévost
A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate causes of Phenomenon, phenomena, and usually frame their understanding in mathematical terms. They work across a wide range of Physics#Research fields, research fields, spanning all length scales: from atom, sub-atomic and particle physics, through biological physics, to physical cosmology, cosmological length scales encompassing the universe as a whole. The field generally includes two types of physicists: Experimental physics, experimental physicists who specialize in the observation of natural phenomena and the development and analysis of experiments, and Theoretical physics, theoretical physicists who specialize in mathematical modeling of physical systems to rationalize, explain and predict natural phenomena. Physicists can apply their k ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Political Economy
Political or comparative economy is a branch of political science and economics studying economic systems (e.g. Marketplace, markets and national economies) and their governance by political systems (e.g. law, institutions, and government). Widely-studied phenomena within the discipline are systems such as labour market, labour and international markets, as well as phenomena such as Economic growth, growth, Distribution of wealth, distribution, Economic inequality, inequality, and International trade, trade, and how these are shaped by institutions, laws, and government policy. Originating in the 18th century, it is the precursor to the modern discipline of economics. Political economy in its modern form is considered an interdisciplinary field, drawing on theory from both political science and Neoclassical economics, modern economics. Political economy originated within 16th century western moral philosophy, with theoretical works exploring the administration of states' wealth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philosophers From The Republic Of Geneva
Philosophy ('love of wisdom' in Ancient Greek) is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, value, mind, and language. It is a rational and critical inquiry that reflects on its methods and assumptions. Historically, many of the individual sciences, such as physics and psychology, formed part of philosophy. However, they are considered separate academic disciplines in the modern sense of the term. Influential traditions in the history of philosophy include Western, Arabic–Persian, Indian, and Chinese philosophy. Western philosophy originated in Ancient Greece and covers a wide area of philosophical subfields. A central topic in Arabic–Persian philosophy is the relation between reason and revelation. Indian philosophy combines the spiritual problem of how to reach enlightenment with the exploration of the nature of reality and the ways of arriving at knowledge. Chinese philosophy focuses principally on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
19th-century Physicists From The Republic Of Geneva
The 19th century began on 1 January 1801 (represented by the Roman numerals MDCCCI), and ended on 31 December 1900 (MCM). It was the 9th century of the 2nd millennium. It was characterized by vast social upheaval. Slavery was abolished in much of Europe and the Americas. The First Industrial Revolution, though it began in the late 18th century, expanded beyond its British homeland for the first time during the 19th century, particularly remaking the economies and societies of the Low Countries, France, the Rhineland, Northern Italy, and the Northeastern United States. A few decades later, the Second Industrial Revolution led to ever more massive urbanization and much higher levels of productivity, profit, and prosperity, a pattern that continued into the 20th century. The Catholic Church, in response to the growing influence and power of modernism, secularism and materialism, formed the First Vatican Council in the late 19th century to deal with such problems and confirm cer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
18th-century Physicists From The Republic Of Geneva
The 18th century lasted from 1 January 1701 (represented by the Roman numerals MDCCI) to 31 December 1800 (MDCCC). During the 18th century, elements of Enlightenment thinking culminated in the Atlantic Revolutions. Revolutions began to challenge the legitimacy of monarchical and aristocratic power structures. The Industrial Revolution began mid-century, leading to radical changes in human society and the environment. The European colonization of the Americas and other parts of the world intensified and associated mass migrations of people grew in size as part of the Age of Sail. During the century, slave trading expanded across the shores of the Atlantic Ocean, while declining in Russia and China. Western historians have occasionally defined the 18th century otherwise for the purposes of their work. For example, the "short" 18th century may be defined as 1715–1789, denoting the period of time between the death of Louis XIV of France and the start of the French Revolution, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1839 Deaths
Events January–March * January 2 – The first photograph of the Moon is taken, by French photographer Louis Daguerre. * January 6 – Night of the Big Wind: Ireland is struck by the most damaging cyclone in 300 years. * January 9 – The French Academy of Sciences announces the daguerreotype photography process. * January 19 – The British Aden Expedition captures Aden. * January 20 – Battle of Yungay: Chile defeats the Peru–Bolivian Confederation, leading to the restoration of an independent Peru. * January – The first parallax measurement of the distance to Alpha Centauri is published by Thomas Henderson. * February 11 – The University of Missouri is established, becoming the first public university west of the Mississippi River. * February 24 – William Otis receives a U.S. patent for the steam shovel. * March 5 – Longwood University is founded in Farmville, Virginia. * March 7 – Baltimore City College, the third public high school in the United Stat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1751 Births
In Britain and its colonies (except Scotland), 1751 only had 282 days due to the Calendar (New Style) Act 1750, which ended the year on 31 December (rather than nearly three months later according to its previous rule). Events January–March * January 1 – As the Province of Georgia undergoes the transition from a trustee-operated territory to a Crown colony, the prohibition against slavery is lifted by the Trustees for the Establishment of the Colony of Georgia in America. At the time, the Black population of Georgia is approximately 400 people, who had been kept in slavery in violation of the law. By 1790, the enslaved population of Georgia increases to over 29,000 and to 462,000 by 1860. * January 7 – The University of Pennsylvania, conceived 12 years earlier by Benjamin Franklin and its other trustees to provide non-denominational higher education "to train young people for leadership in business, government and public service". rather than for t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiative Equilibrium
Radiative equilibrium is the condition where the total thermal radiation leaving an object is equal to the total thermal radiation entering it. It is one of the several requirements for thermodynamic equilibrium, but it can occur in the absence of thermodynamic equilibrium. There are various types of radiative equilibrium, which is itself a kind of dynamic equilibrium. Definitions Equilibrium, in general, is a state in which opposing forces are balanced, and hence a system does not change in time. Radiative equilibrium is the specific case of thermal equilibrium, for the case in which the exchange of heat is done by radiative heat transfer. There are several types of radiative equilibrium. Prevost's definitions An important early contribution was made by Pierre Prevost in 1791. Prevost considered that what is nowadays called the photon gas or electromagnetic radiation was a fluid that he called "free heat". Prevost proposed that free radiant heat is a very rare fluid, rays of wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiation
In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or a material medium. This includes: * ''electromagnetic radiation'' consisting of photons, such as radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and Gamma ray, gamma radiation (γ) * ''particle radiation'' consisting of particles of non-zero rest energy, such as alpha radiation (α), beta radiation (β), proton radiation and neutron radiation * ''acoustics, acoustic radiation'', such as ultrasound, sound, and seismic waves, all dependent on a physical transmission medium * ''gravitational radiation'', in the form of gravitational waves, ripples in spacetime Radiation is often categorized as either ''ionizing radiation, ionizing'' or ''non-ionizing radiation, non-ionizing'' depending on the energy of the radiated particles. Ionizing radiation carries more than 10 electron volt, electron volts (eV), which is enough to ionize atoms and molecul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Georges-Louis Le Sage
Georges-Louis Le Sage (; 13 June 1724 – 20 November 1803) was a Genevan physicist and is most known for his theory of gravitation, for his invention of an electric telegraph and his anticipation of the kinetic theory of gases. He was a contributor to Diderot's ''Encyclopédie''. Life and education Le Sage was born in Geneva, his father, a descendant of Théodore Agrippa d'Aubigné, was Georges-Louis Le Sage from Couches in Burgundy, and his mother Anne Marie Camp. His father, who was the author of many papers on various subjects, occupied his son of his own studies early, including the works of the Roman poet Lucretius at the age of 13. According to Pierre Prévost and some notices of Le Sage, the education by his parents in his early years was very strict, and Le Sage reacted to this by isolating himself and with meditation on various subjects. Contrary to his father, who allegedly only accepted facts and had little interest in generalisation, Le Sage was primarily in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philology
Philology () is the study of language in Oral tradition, oral and writing, written historical sources. It is the intersection of textual criticism, literary criticism, history, and linguistics with strong ties to etymology. Philology is also defined as the study of literary texts and oral and written records, the establishment of their authentication, authenticity and their original form, and the determination of their meaning. A person who pursues this kind of study is known as a philologist. In older usage, especially British, philology is more general, covering comparative linguistics, comparative and historical linguistics. Classical philology studies classical languages. Classical philology principally originated from the Library of Pergamum and the Library of Alexandria around the fourth century BC, continued by Greeks and Romans throughout the Roman Empire, Roman and Byzantine Empire. It was eventually resumed by European scholars of the Renaissance humanism, Renaissance, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnetism
Magnetism is the class of physical attributes that occur through a magnetic field, which allows objects to attract or repel each other. Because both electric currents and magnetic moments of elementary particles give rise to a magnetic field, magnetism is one of two aspects of electromagnetism. The most familiar effects occur in ferromagnetic materials, which are strongly attracted by magnetic fields and can be magnetized to become permanent magnets, producing magnetic fields themselves. Demagnetizing a magnet is also possible. Only a few substances are ferromagnetic; the most common ones are iron, cobalt, nickel, and their alloys. All substances exhibit some type of magnetism. Magnetic materials are classified according to their bulk susceptibility. Ferromagnetism is responsible for most of the effects of magnetism encountered in everyday life, but there are actually several types of magnetism. Paramagnetic substances, such as aluminium and oxygen, are weakly attracted ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
