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Jurin's Law
Jurin's law, or capillary rise, is the simplest analysis of capillary action—the induced motion of liquids in small channels—and states that the maximum height of a liquid in a capillary tube is inversely proportional to the tube's diameter. Capillary action is one of the most common fluid mechanical effects explored in the field of microfluidics. Jurin's law is named after James Jurin, who discovered it between 1718 and 1719.See: * James Jurin (1718"An account of some experiments shown before the Royal Society; with an enquiry into the cause of some of the ascent and suspension of water in capillary tubes,"''Philosophical Transactions of the Royal Society of London'', 30 : 739–747. * James Jurin (1719"An account of some new experiments, relating to the action of glass tubes upon water and quicksilver,"''Philosophical Transactions of the Royal Society of London'', 30 : 1083–1096. His quantitative law suggests that the maximum height of liquid in a capillary tube is inverse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capillarity
Capillary action (sometimes called capillarity, capillary motion, capillary rise, capillary effect, or wicking) is the process of a liquid flowing in a narrow space without the assistance of external forces like Gravitation, gravity. The effect can be seen in the drawing up of liquids between the hairs of a paint-brush, in a thin tube such as a Drinking straw, straw, in porous materials such as paper and plaster, in some non-porous materials such as clay and liquefied carbon fiber, or in a biological cell. It occurs because of intermolecular forces between the liquid and surrounding solid surfaces. If the diameter of the tube is sufficiently small, then the combination of surface tension (which is caused by Cohesion (chemistry), cohesion within the liquid) and Adhesion, adhesive forces between the liquid and container wall act to propel the liquid. Etymology Capillary comes from the Latin word capillaris, meaning "of or resembling hair". The meaning stems from the tiny, hairl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Osmotic Pressure
Osmotic pressure is the minimum pressure which needs to be applied to a Solution (chemistry), solution to prevent the inward flow of its pure solvent across a semipermeable membrane. It is also defined as the measure of the tendency of a solution to take in its pure solvent by osmosis. Potential osmotic pressure is the maximum osmotic pressure that could develop in a solution if it was not separated from its pure solvent by a semipermeable membrane. Osmosis occurs when two solutions containing different concentrations of solute are separated by a selectively permeable membrane. Solvent molecules pass preferentially through the membrane from the low-concentration solution to the solution with higher solute concentration. The transfer of solvent molecules will continue until ''osmotic equilibrium'' is attained. Theory and measurement Jacobus Henricus van 't Hoff, Jacobus van 't Hoff found a quantitative relationship between osmotic pressure and solute concentration, expre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laplace Pressure
The Laplace pressure is the pressure difference between the inside and the outside of a curved surface that forms the boundary between two fluid regions. The pressure difference is caused by the surface tension of the interface between liquid and gas, or between two immiscible liquids. The Laplace pressure is determined from the Young–Laplace equation given as \Delta P \equiv P_\text - P_\text = \gamma\left(\frac+\frac\right), where R_1 and R_2 are the principal curvature, principal radii of curvature and \gamma (also denoted as \sigma) is the surface tension. Although signs for these values vary, sign convention usually dictates positive curvature when convex and negative when concave. The Laplace pressure is commonly used to determine the pressure difference in spherical shapes such as bubbles or droplets. In this case, R_1 = R_2: \Delta P = \gamma\frac For a gas bubble within a liquid, there is only one surface. For a gas bubble with a liquid wall, beyond which is again ga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrostatic Pressure
Hydrostatics is the branch of fluid mechanics that studies fluids at hydrostatic equilibrium and "the pressure in a fluid or exerted by a fluid on an immersed body". The word "hydrostatics" is sometimes used to refer specifically to water and other liquids, but more often it includes both gases and liquids, whether Compressible flow, compressible or Incompressible flow, incompressible. It encompasses the study of the conditions under which fluids are at rest in Mechanical equilibrium, stable equilibrium. It is opposed to ''fluid dynamics'', the study of fluids in motion. Hydrostatics is fundamental to ''hydraulics'', the engineering of equipment for storing, transporting and using fluids. It is also relevant to geophysics and astrophysics (for example, in understanding plate tectonics and the anomalies of the Gravity of Earth, Earth's gravitational field), to meteorology, to medicine (in the context of blood pressure), and many other fields. Hydrostatics offers physical expl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jurin Equation
Jurin () is a village in northern Syria, located in the Shathah Subdistrict of the Suqaylabiyah District in the Hama Governorate. According to the Syria Central Bureau of Statistics (CBS), Jurin had a population of 2,326 in the 2004 census. Its inhabitants are predominantly Alawites Alawites () are an Arab ethnoreligious group who live primarily in the Levant region in West Asia and follow Alawism, a sect of Islam that splintered from early Shia as a ''ghulat'' branch during the ninth century. Alawites venerate Ali .... References Alawite communities in Syria Populated places in al-Suqaylabiyah District {{HamaSY-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Opticks
''Opticks: or, A Treatise of the Reflexions, Refractions, Inflexions and Colours of Light'' is a collection of three books by Isaac Newton that was published in English language, English in 1704 (a scholarly Latin translation appeared in 1706). (''Opticks'' was originally published in 1704). The treatise analyzes the fundamental nature of light by means of the refraction of light with prisms and lenses, the diffraction of light by closely spaced sheets of glass, and the behaviour of color mixtures with spectral lights or pigment powders. ''Opticks'' was Newton's second major work on physical science and it is considered one of the three major works on optics during the Scientific Revolution (alongside Johannes Kepler's ''Astronomiae Pars Optica'' and Christiaan Huygens' ''Treatise on Light''). Overview The publication of ''Opticks'' represented a major contribution to science, different from but in some ways rivalling the ''Philosophiae Naturalis Principia Mathematica, Principia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isaac Newton
Sir Isaac Newton () was an English polymath active as a mathematician, physicist, astronomer, alchemist, theologian, and author. Newton was a key figure in the Scientific Revolution and the Age of Enlightenment, Enlightenment that followed. His book (''Mathematical Principles of Natural Philosophy''), first published in 1687, achieved the Unification of theories in physics#Unification of gravity and astronomy, first great unification in physics and established classical mechanics. Newton also made seminal contributions to optics, and Leibniz–Newton calculus controversy, shares credit with German mathematician Gottfried Wilhelm Leibniz for formulating calculus, infinitesimal calculus, though he developed calculus years before Leibniz. Newton contributed to and refined the scientific method, and his work is considered the most influential in bringing forth modern science. In the , Newton formulated the Newton's laws of motion, laws of motion and Newton's law of universal g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Francis Hauksbee
Francis Hauksbee the Elder (1660–1713), also known as Francis Hawksbee, was an 18th-century English scientist best known for his work on electricity and electrostatic repulsion. Biography Francis Hauksbee was the son of draper and common councillor Richard Hauksbee and his wife Mary. He was baptized on 27 May 1660 in the parish of St Mary-at-the-Walls, Colchester. He was the fifth of five sons. In 1673 Hauksbee entered Colchester Royal Grammar School. From 1678 to at least 1685 he apprenticed as a draper in the City of London, initially to his eldest brother. He was married no later than May 1687, when a daughter was born. Five of his eight children survived infancy. From 1687 to 1703, he may have run his own drapery shop. From at least March 1701, he lived at Giltspur Street, where he made air-pumps and pneumatic engines. The transition from drapery to scientific instrumentation and experimentation is not well documented. Historians have had to speculate about the events ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giovanni Alfonso Borelli
Giovanni Alfonso Borelli (; 28 January 1608 – 31 December 1679) was a Renaissance Italy, Italian physiologist, physicist, and mathematician who is often described as the father of biomechanics. He contributed to the modern principle of scientific investigation by continuing Galileo Galilei, Galileo's practice of testing hypotheses against observation. Trained in mathematics, Borelli also made extensive studies of Jupiter's moons, the mechanics of animal locomotion and, in microscopy, of the constituents of blood. He also used microscopy to investigate the stomatal movement of plants, and undertook studies in medicine and geology. During his career, he enjoyed the patronage of Queen Christina of Sweden. He was the first scientist to explain that animal and human bodily movements are caused by muscular contractions. Biography Giovanni Borelli was born on 28 January 1608 in the district of Castel Nuovo, in Naples. He was the first-born son of Spanish infantryman Miguel Alfonso and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geminiano Montanari
Geminiano Montanari (1 June 1633 – 13 October 1687) was an Italian astronomer, lens-maker, and proponent of the experimental approach to science. He was a member of various learned academies, notably the Accademia dei Gelati. Montanari's famous students include Domenico Guglielmini, Francesco Bianchini, Gianantonio Davia and Luigi Ferdinando Marsili. He is best known for his observation, made around 1667, that the second-brightest star (called Algol as derived from its name in Arabic) in the constellation of Perseus varied in brightness. It is likely that others had observed this effect before, but Montanari was the first named astronomer to record it. The star's names in Arabic, Hebrew and other languages, all of which have a meaning of "ghoul" or "demon", imply that its unusual behaviour had long been recognised. Biography Montanari was born in Modena on June 1, 1633. The son of Giovanni Montanari and Margherita Zanasi, he was left fatherless at age ten. Montanari b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jacques Rohault
Jacques Rohault (; 1618 – 27 December 1672) was a French philosopher, physicist and mathematician, and a follower of Cartesianism. Life Rohault was born in Amiens, the son of a wealthy wine merchant, and educated in Paris. Having grown up with the conventional scholastic philosophy of his day, he adopted and popularised the new Cartesian physics. His Wednesday lectures in Paris became celebrated; they began in the 1650s, and attracted in particular Pierre-Sylvain Régis. Rohault died on December 27, 1672, in Paris. Works Rohault held to the mechanical philosophy, and gave qualified support to its "corpuscular" or atomic form of explanation, assuming that "small figured bodies" were the underlying physical reality. His ''Traité de physique'' (Paris, 1671) became a standard textbook for half a century. It followed the precedent set by Henricus Regius in separating physics from metaphysics. It also included the theory of gravitation of Christiaan Huygens, given in terms of an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountain Stream
A mountain stream is a Stream, brook or stream, usually with a steep gradient, flowing down a mountainside. Its swift flow rate often transports large quantities of rock (geology), rock, gravel, soil, wood or even entire Trunk (botany), logs with the stream. The main characteristic of mountain streams in the Alpine region is their steep gradient and sharply varying rates of flow within a short period of time, as a result of snowmelt and sudden storms. Streams of such nature are rarer in gently rolling countryside, although they may occur on scarp slopes where, although the height difference is not so great, they tend to have a larger drainage basin, catchment area than mountain streams. Mountain streams may be broadly divided into three sections. In the "catchment funnel" (''Sammeltrichter'') high on the mountainsides, water and erosion (geology), eroded soil, rock and gravel are gathered. The stream then flows at high speed through a "drainage channel" (''Abflussrinne'') into the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
