法拉第的SAT寫作經(jīng)典例子

法拉第的SAT寫作經(jīng)典例子，相信這個問題是許多正在準(zhǔn)備留學(xué)的同學(xué)關(guān)心的一個問題，那么下面小編就來和大家說一說，感興趣的您趕緊往下了解吧。

The English chemist and physicist Michael Faraday, b. Sept. 22, 1791, d.Aug. 25, 1867, is known for his pioneering experiments in electricity andmagnetism. Many consider him the greatest experimentalist who ever lived.

Several concepts that he derived directly from experiments, such as lines of magnetic force, have become common ideas in modern physics.

Faraday was born at Newington, Surrey, near London. He received little more than a primary education, and at the age of 14 he was apprenticed to a bookbinder. There he became interested in the physical and chemical works of the time. After hearing a lecture by the famous chemist Humphry Davy, he sent Davy the notes he had made of his lectures. As a result Faraday was appointed, at the age of 21, assistant to Davy in the laboratory of the Royal Institution in London.

During the initial years of his scientific work, Faraday occupied himself mainly with chemical problems. He discovered two new chlorides of carbon and succeeded in liquefying chlorine and other gases. He isolated benzene in 1825, the year in which he was appointed director of the laboratory.

Davy, who had the greatest influence on Faraday's thinking, had shown in 1807 that the metals sodium and potassium can be precipitated from their compounds by an electric current, a process known as electrolysis.

Faraday's vigorous pursuit of these experiments led in 1834 to what became known as Faraday's laws of electrolysis.

Faraday's research into electricity and electrolysis was guided by the belief that electricity is only one of the many manifestations of the unified forces of nature, which included heat, light, magnetism, and chemical affinity. Although this idea was erroneous, it led him into the field of electromagnetism, which was still in its infancy.

In 1785, Charles Coulomb had been the first to demonstrate the manner in which electric charges repel one another, and it was not until 1820 that Hans Christian Oersted and Andre Marie Ampere discovered that an electric current produces a magnetic field. Faraday's ideas about conservation of energy led him to believe that since an electric current could cause a magnetic field, a magnetic field should be able to produce an electric current. He demonstrated this principle of induction in 1831. Faraday expressed the electric current induced in the wire in terms of the number of lines of force that are cut by the wire.

The principle of induction was a landmark in applied science, for it made possible the dynamo, or generator, which produces electricity by mechanical means.

Faraday's introduction of the concept of lines of force was rejected by most of the mathematical physicists of Europe, since they assumed that electric charges attract and repel one another, by action at a distance, making such lines unnecessary. Faraday had demonstrated the phenomenon of electromagnetism in a series of experiments, however.

This experimental necessity probably led the physicist James Clerk Maxwell to accept the concept of lines of force and put Faraday's ideas into mathematical form, thus giving birth to modern field theory.

Faraday's discovery (1845) that an intense magnetic field can rotate the plane of polarized light is known today as the Faraday effect. The phenomenon has been used to elucidate molecular structure and has yielded information about galactic magnetic fields.

Faraday described his numerous experiments in electricity and electromagnetism in three volumes entitled Experimental Researches in Electricity (1839, 1844, 1855); his chemical work was chronicled in Experimental Researches in Chemistry and Physics (1858). Faraday ceased research work in 1855 because of declining mental powers, but he continued as a lecturer until 1861. A series of six children's lectures published in 1860 as The Chemical History of a Candle, has become a classic of science literature.

邁克爾·法拉第(Michael Faraday，公元1791～公元1867)英國物理學(xué)家、化學(xué)家，也是自學(xué)成才的科學(xué)家。生于薩里郡紐因頓一個貧苦鐵匠家庭。僅上過小學(xué)。1831年，他作出了關(guān)于力場的關(guān)鍵性突破，永遠改變了人類文明。1815年5月回到皇家研究所在戴維指導(dǎo)下進行化學(xué)研究。1824年1月當(dāng)選皇家學(xué)會會員，1825年2月任研究所實驗室主任，1833----1862任研究所化學(xué)教授。1846年榮獲倫福德獎?wù)潞蛣渍隆?/p>

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