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Archimedes' principle[değiştir | kaynağı değiştir]

By placing a metal bar in a container with water on a scale, the bar displaces as much water as its own volume, increasing its mass and weighing down the scale.

The most widely known anecdote about Archimedes tells of how he invented a method for determining the volume of an object with an irregular shape. According to Vitruvius, a votive crown for a temple had been made for King Hiero II of Syracuse, who had supplied the pure gold to be used, and Archimedes was asked to determine whether some silver had been substituted by the dishonest goldsmith.[1] Archimedes had to solve the problem without damaging the crown, so he could not melt it down into a regularly shaped body in order to calculate its density. While taking a bath, he noticed that the level of the water in the tub rose as he got in, and realized that this effect could be used to determine the volume of the crown. For practical purposes water is incompressible,[2] so the submerged crown would displace an amount of water equal to its own volume. By dividing the mass of the crown by the volume of water displaced, the density of the crown could be obtained. This density would be lower than that of gold if cheaper and less dense metals had been added. Archimedes then took to the streets naked, so excited by his discovery that he had forgotten to dress, crying "Eureka!" (Şablon:Lang-el, heúrēka!", meaning "I have found [it]!").[1] The test was conducted successfully, proving that silver had indeed been mixed in.[3]

The story of the golden crown does not appear in the known works of Archimedes. Moreover, the practicality of the method it describes has been called into question, due to the extreme accuracy with which one would have to measure the water displacement.[4] Archimedes may have instead sought a solution that applied the principle known in hydrostatics as Archimedes' principle, which he describes in his treatise On Floating Bodies. This principle states that a body immersed in a fluid experiences a buoyant force equal to the weight of the fluid it displaces.[5] Using this principle, it would have been possible to compare the density of the crown to that of pure gold by balancing the crown on a scale with a pure gold reference sample of the same weight, then immersing the apparatus in water. The difference in density between the two samples would cause the scale to tip accordingly. Galileo considered it "probable that this method is the same that Archimedes followed, since, besides being very accurate, it is based on demonstrations found by Archimedes himself."[6] In a 12th-century text titled Mappae clavicula there are instructions on how to perform the weighings in the water in order to calculate the percentage of silver used, and thus solve the problem.[7][8] The Latin poem Carmen de ponderibus et mensuris of the 4th or 5th century describes the use of a hydrostatic balance to solve the problem of the crown, and attributes the method to Archimedes.[7]

  1. ^ a b Vitruvius (2006-12-31). De Architectura, Book IX, paragraphs 9–12. Project Gutenberg. Erişim tarihi: 2018-12-26. 
  2. ^ "Incompressibility of Water". Harvard University. 17 March 2008 tarihinde kaynağından arşivlendi. Erişim tarihi: 2008-02-27. 
  3. ^ HyperPhysics. "Buoyancy". Georgia State University. 14 July 2007 tarihinde kaynağından arşivlendi. Erişim tarihi: 2007-07-23. 
  4. ^ Rorres, Chris. "The Golden Crown". Drexel University. 11 March 2009 tarihinde kaynağından arşivlendi. Erişim tarihi: 2009-03-24. 
  5. ^ Carroll, Bradley W. "Archimedes' Principle". Weber State University. 8 August 2007 tarihinde kaynağından arşivlendi. Erişim tarihi: 2007-07-23. 
  6. ^ Rorres, Chris. "The Golden Crown: Galileo's Balance". Drexel University. 24 February 2009 tarihinde kaynağından arşivlendi. Erişim tarihi: 2009-03-24. 
  7. ^ a b O.A.W. Dilke. Gnomon. 62. Bd., H. 8 (1990), pp. 697–699 Published by: Verlag C.H.Beck
  8. ^ Marcel Berthelot – Sur l histoire de la balance hydrostatique et de quelques autres appareils et procédés scientifiques, Annales de Chimie et de Physique [série 6], 23 / 1891, pp. 475–485