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1:52 PM
190 лет со дня рождения Йоханнеса Дидерика Ван-дер-Ваальса / 190 years since the birth of Johannes Diderik van der Waals

Йоханнес Дидерик Ван дер Ваа́льс (23 ноября 1837, Лейден8 марта 1923, Амстердам) — голландский физик, лауреат Нобелевской премии по физике в 1910 г.

Йоханнес Дидерик Ван дер Ваальс родился 23 ноября 1837 г. в семье Якобуса Ван дер Ваальса, плотника, и Элизабет Ван дер Ваальс (в девичестве Ван-ден-Бург).

После окончания школы Ван дер Ваальс работал учителем младшей школы в своём родном городе Лейден. Без получения допуска к учёбе в университете (Abitur, вольнослушатель), он посещал тем не менее с 1862 по 1865 гг. лекции и семинары в Лейденском университете. Таким образом ему удалось расширить свой сертификат учителя на области физики и математики в средней школе. С 1864 г. он занял должность учителя в Девентере. С 1866 г. работал в школе в Гааге, где впоследствии стал директором. После изменения законов у него появилась возможность продолжить обучение в университете. Удостоен Лейденским университетом учёной степени доктора философии в 1873 г. за диссертацию, признаваемую ныне классической: «Over de continuïteit van den gas- en vloeistoftoestand» (немецкий перевод появился в Лейпциге в 1881 г.). Джеймс Клерк Максвелл, сказал о работе Ван дер Ваальса: «Она сразу поставила его имя в один ряд с самыми выдающимися именами в науке».

С открытием Амстердамского университета (1877) занимает в нём профессуру физики, и работает там с 1877 по 1908 г.

Большая часть работ Ван дер Ваальса относится к области теоретической молекулярной физики. Он исследовал поведение молекул и занимался теориями, описывающими состояния материи. В 1869 году он открыл силы взаимодействия между молекулами, которые впоследствии были названы его именем — силы Ван-дер-Ваальса. В 1873 году в своей диссертации он развил модель, единообразно описывающую газообразную и жидкую фазы вещества. На основе этой модели он вывел уравнение состояния, показавшее, что при некоторой температуре исчезают различия в физических свойствах жидкости и её пара, находящихся в равновесии. При такой температуре, называемой критической, плотность жидкости и её насыщенного пара становятся одинаковыми и исчезает видимая граница между ними.

За это достижение Ван дер Ваальс получил в 1910 г. Нобелевскую премию по физике «за работу над уравнением состояния газов и жидкостей».

https://ru.wikipedia.org/wiki/%D0%92%D0%B0%D0%BD_%D0%B4%D0%B5%D1%80_%D0%92%D0%B0%D0%B0%D0%BB%D1%8C%D1%81,_%D0%99%D0%BE%D1%85%D0%B0%D0%BD%D0%BD%D0%B5%D1%81_%D0%94%D0%B8%D0%B4%D0%B5%D1%80%D0%B8%D0%BA

Johannes Diderik van der Waals (Dutch: [joːˈɦɑnəz ˈdidəˌrɪk fɑn dɛr ˈʋaːls]; 23 November 1837 – 8 March 1923) was a Dutch theoretical physicist and thermodynamicist famous for his work on an equation of state for gases and liquids.

His name is primarily associated with the van der Waals equation of state that describes the behavior of gases and their condensation to the liquid phase. His name is also associated with van der Waals forces (forces between stable molecules), with van der Waals molecules (small molecular clusters bound by van der Waals forces), and with van der Waals radii (sizes of molecules). As James Clerk Maxwell said about Van der Waals, "there can be no doubt that the name of Van der Waals will soon be among the foremost in molecular science."

In his 1873 thesis, van der Waals noted the non-ideality of real gases and attributed it to the existence of intermolecular interactions. He introduced the first equation of state derived by the assumption of a finite volume occupied by the constituent molecules. Spearheaded by Ernst Mach and Wilhelm Ostwald, a strong philosophical current that denied the existence of molecules arose towards the end of the 19th century. The molecular existence was considered unproven and the molecular hypothesis unnecessary. At the time van der Waals' thesis was written (1873), the molecular structure of fluids had not been accepted by most physicists, and liquid and vapor were often considered as chemically distinct. But van der Waals's work affirmed the reality of molecules and allowed an assessment of their size and attractive strength. His new formula revolutionized the study of equations of state. By comparing his equation of state with experimental data, Van der Waals was able to obtain estimates for the actual size of molecules and the strength of their mutual attraction. The effect of Van der Waals's work on molecular physics in the 20th century was direct and fundamental. By introducing parameters characterizing molecular size and attraction in constructing his equation of state, Van der Waals set the tone for modern molecular science. That molecular aspects such as size, shape, attraction, and multipolar interactions should form the basis for mathematical formulations of the thermodynamic and transport properties of fluids is presently considered an axiom. With the help of the van der Waals's equation of state, the critical-point parameters of gases could be accurately predicted from thermodynamic measurements made at much higher temperatures. Nitrogen, oxygen, hydrogen, and helium subsequently succumbed to liquefaction. Heike Kamerlingh Onnes was significantly influenced by the pioneer work of van der Waals. In 1908, Onnes became the winner of the race to make liquid helium and because of this, he was also to be the discoverer of superconductivity in 1911

A largely self-taught man in mathematics and physics, van der Waals originally worked as a school teacher. He became the first physics professor of the University of Amsterdam when in 1877 the old Athenaeum was upgraded to Municipal University. Van der Waals won the 1910 Nobel Prize in physics for his work on the equation of state for gases and liquids.

The main interest of van der Waals was in the field of thermodynamics. He was influenced by Rudolf Clausius' 1857 treatise entitled Über die Art der Bewegung, welche wir Wärme nennen (On the Kind of Motion which we Call Heat). Van der Waals was later greatly influenced by the writings of James Clerk Maxwell, Ludwig Boltzmann, and Willard Gibbs. Clausius' work led him to look for an explanation of Thomas Andrews' experiments that had revealed, in 1869, the existence of critical temperatures in fluids. He managed to give a semi-quantitative description of the phenomena of condensation and critical temperatures in his 1873 thesis, entitled Over de Continuïteit van den Gas- en Vloeistoftoestand (On the continuity of the gas and liquid state). This dissertation represented a hallmark in physics and was immediately recognized as such, e.g. by James Clerk Maxwell who reviewed it in Nature in a laudatory manner.

In this thesis he derived the equation of state bearing his name. This work gave a model in which the liquid and the gas phase of a substance merge into each other in a continuous manner. It shows that the two phases are of the same nature. In deriving his equation of state van der Waals assumed not only the existence of molecules (the existence of atoms was disputed at the time), but also that they are of finite size and attract each other. Since he was one of the first to postulate an intermolecular force, however rudimentary, such a force is now sometimes called a van der Waals force.

A second great discovery was published in 1880, when he formulated the Law of Corresponding States. This showed that the van der Waals equation of state can be expressed as a simple function of the critical pressure, critical volume, and critical temperature. This general form is applicable to all substances (see van der Waals equation.) The compound-specific constants a and b in the original equation are replaced by universal (compound-independent) quantities. It was this law which served as a guide during experiments which ultimately led to the liquefaction of hydrogen by James Dewar in 1898 and of helium by Heike Kamerlingh Onnes in 1908.

In 1890, van der Waals published a treatise on the Theory of Binary Solutions in the Archives Néerlandaises. By relating his equation of state with the Second Law of Thermodynamics, in the form first proposed by Willard Gibbs, he was able to arrive at a graphical representation of his mathematical formulations in the form of a surface which he called Ψ (Psi) surface following Gibbs, who used the Greek letter Ψ for the free energy of a system with different phases in equilibrium.

Mention should also be made of van der Waals' theory of capillarity which in its basic form first appeared in 1893. In contrast to the mechanical perspective on the subject provided earlier by Pierre-Simon Laplace, van der Waals took a thermodynamic approach. This was controversial at the time, since the existence of molecules and their permanent, rapid motion were not universally accepted before Jean Baptiste Perrin's experimental verification of Albert Einstein's theoretical explanation of Brownian motion.

https://en.wikipedia.org/wiki/Johannes_Diderik_van_der_Waals

 

Category: История науки- Нistory of science | Added by: zvonimirveres
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