Svante August Arrhenius
19 February 1859
|Died||2 October 1927 (aged 68)|
|Institutions||Royal Institute of Technology|
|Doctoral students||Oskar Benjamin Klein|
Svante August Arrhenius (; 19 February 1859 - 2 October 1927) was a Swedish scientist. Originally a physicist, but often referred to as a chemist, Arrhenius was one of the founders of the science of physical chemistry. He received the Nobel Prize for Chemistry in 1903, becoming the first Swedish Nobel laureate. In 1905, he became director of the Nobel Institute, where he remained until his death.
Arrhenius was the first to use principles of physical chemistry to estimate the extent to which increases in atmospheric carbon dioxide are responsible for the Earth's increasing surface temperature. In the 1960s, Charles David Keeling demonstrated that the quantity of human-caused carbon dioxide emissions into the air is enough to cause global warming.
The Arrhenius equation, Arrhenius acid, Arrhenius base, lunar crater Arrhenius, Martian crater Arrhenius, the mountain of Arrheniusfjellet, and the Arrhenius Labs at Stockholm University were so named to commemorate his contributions to science.
Arrhenius was born on 19 February 1859 at Vik (also spelled Wik or Wijk), near Uppsala, Kingdom of Sweden, United Kingdoms of Sweden and Norway, the son of Svante Gustav and Carolina Thunberg Arrhenius. His father had been a land surveyor for Uppsala University, moving up to a supervisory position. At the age of three, Arrhenius taught himself to read without the encouragement of his parents, and by watching his father's addition of numbers in his account books, became an arithmetical prodigy. In later life, Arrhenius was profoundly passionate about mathematical concepts, data analysis and discovering their relationships and laws.
At the University of Uppsala, he was dissatisfied with the chief instructor of physics and the only faculty member who could have supervised him in chemistry, Per Teodor Cleve, so he left to study at the Physical Institute of the Swedish Academy of Sciences in Stockholm under the physicist Erik Edlund in 1881.
His work focused on the conductivities of electrolytes. In 1884, based on this work, he submitted a 150-page dissertation on electrolytic conductivity to Uppsala for the doctorate. It did not impress the professors, among whom was Cleve, and he received a fourth-class degree, but upon his defense it was reclassified as third-class. Later, extensions of this very work would earn him the 1903 Nobel Prize in Chemistry.
Arrhenius put forth 56 theses in his 1884 dissertation, most of which would still be accepted today unchanged or with minor modifications. The most important idea in the dissertation was his explanation of the fact that solid crystalline salts disassociate into paired charged particles when dissolved, for which he would win the 1903 Nobel Prize in Chemistry. Arrhenius's explanation was that in forming a solution, the salt disassociates into charged particles, to which Michael Faraday had given the name ions many years earlier. Faraday's belief had been that ions were produced in the process of electrolysis, that is, an external direct current source of electricity was necessary to form ions. Arrhenius proposed that, even in the absence of an electric current, aqueous solutions of salts contained ions. He thus proposed that chemical reactions in solution were reactions between ions.
The dissertation did not impress the professors at Uppsala, but Arrhenius sent it to a number of scientists in Europe who were developing the new science of physical chemistry, such as Rudolf Clausius, Wilhelm Ostwald, and J. H. van 't Hoff. They were far more impressed, and Ostwald even came to Uppsala to persuade Arrhenius to join his research team. Arrhenius declined, however, as he preferred to stay in Sweden-Norway for a while (his father was very ill and would die in 1885) and had received an appointment at Uppsala.
In an extension of his ionic theory Arrhenius proposed definitions for acids and bases, in 1884. He believed that acids were substances that produce hydrogen ions in solution and that bases were substances that produce hydroxide ions in solution.
In 1885, Arrhenius next received a travel grant from the Swedish Academy of Sciences, which enabled him to study with Ostwald in Riga (now in Latvia), with Friedrich Kohlrausch in Würzburg, Germany, with Ludwig Boltzmann in Graz, Austria, and with van 't Hoff in Amsterdam.
In 1889, Arrhenius explained the fact that most reactions require added heat energy to proceed by formulating the concept of activation energy, an energy barrier that must be overcome before two molecules will react. The Arrhenius equation gives the quantitative basis of the relationship between the activation energy and the rate at which a reaction proceeds.
In 1891, he became a lecturer at the Stockholm University College (Stockholms Högskola, now Stockholm University), being promoted to professor of physics (with much opposition) in 1895, and rector in 1896.
About 1900, Arrhenius became involved in setting up the Nobel Institutes and the Nobel Prizes. He was elected a member of the Royal Swedish Academy of Sciences in 1901. For the rest of his life, he would be a member of the Nobel Committee on Physics and a de facto member of the Nobel Committee on Chemistry. He used his positions to arrange prizes for his friends (Jacobus van't Hoff, Wilhelm Ostwald, Theodore Richards) and to attempt to deny them to his enemies (Paul Ehrlich, Walther Nernst, Dmitri Mendeleev). In 1901 Arrhenius was elected to the Swedish Academy of Sciences, against strong opposition. In 1903 he became the first Swede to be awarded the Nobel Prize in chemistry. In 1905, upon the founding of the Nobel Institute for Physical Research at Stockholm, he was appointed rector of the institute, the position where he remained until retirement in 1927.
In 1911, he won the first Willard Gibbs Award.
Eventually, Arrhenius's theories became generally accepted and he turned to other scientific topics. In 1902, he began to investigate physiological problems in terms of chemical theory. He determined that reactions in living organisms and in the test tube followed the same laws.
In 1904, he delivered at the University of California a course of lectures, the object of which was to illustrate the application of the methods of physical chemistry to the study of the theory of toxins and antitoxins, and which were published in 1907 under the title Immunochemistry. He also turned his attention to geology (the origin of ice ages), astronomy, physical cosmology, and astrophysics, accounting for the birth of the solar system by interstellar collision. He considered radiation pressure as accounting for comets, the solar corona, the aurora borealis, and zodiacal light.
He thought life might have been carried from planet to planet by the transport of spores, the theory now known as panspermia. He thought of the idea of a universal language, proposing a modification of the English language.
He was a board member for the Swedish Society for Racial Hygiene (founded 1909), which endorsed mendelism at the time, and contributed to the topic of contraceptives around 1910. However, until 1938 information and sale of contraceptives was prohibited in the Kingdom of Sweden. Gordon Stein wrote that Svante Arrhenius was an atheist. In his last years he wrote both textbooks and popular books, trying to emphasize the need for further work on the topics he discussed. In September 1927, he came down with an attack of acute intestinal catarrh and died on 2 October. He was buried in Uppsala.
He was married twice, first to his former pupil Sofia Rudbeck (1894 to 1896), with whom he had one son, Olof Arrhenius, and then to Maria Johansson (1905 to 1927), with whom he had two daughters and a son.
In developing a theory to explain the ice ages, Arrhenius, in 1896, was the first to use basic principles of physical chemistry to calculate estimates of the extent to which increases in atmospheric carbon dioxide (CO2) will increase Earth's surface temperature through the greenhouse effect. These calculations led him to conclude that human-caused CO2 emissions, from fossil-fuel burning and other combustion processes, are large enough to cause global warming. This conclusion has been extensively tested, winning a place at the core of modern climate science. Arrhenius, in this work, built upon the prior work of other famous scientists, including Joseph Fourier, John Tyndall and Claude Pouillet. Arrhenius wanted to determine whether greenhouse gases could contribute to the explanation of the temperature variation between glacial and inter-glacial periods. Arrhenius used infrared observations of the moon - by Frank Washington Very and Samuel Pierpont Langley at the Allegheny Observatory in Pittsburgh - to calculate how much of infrared (heat) radiation is captured by CO2 and water (H2O) vapour in Earth's atmosphere. Using 'Stefan's law' (better known as the Stefan-Boltzmann law), he formulated what he referred to as a 'rule'. In its original form, Arrhenius's rule reads as follows:
Here, Arrhenius refers to CO2 as carbonic acid (which refers only to the aqueous form H2CO3 in modern usage). The following formulation of Arrhenius's rule is still in use today:
where is the concentration of CO2 at the beginning (time-zero) of the period being studied (if the same concentration unit is used for both and , then it doesn't matter which concentration unit is used); is the CO2 concentration at end of the period being studied; ln is the natural logarithm (= log base e ); and is the augmentation of the temperature, in other words the change in the rate of heating Earth's surface (radiative forcing), which is measured in Watts per square meter. Derivations from atmospheric radiative transfer models have found that (alpha) for CO2 is 5.35 (± 10%) W/m2 for Earth's atmosphere.
Based on information from his colleague Arvid Högbom, Arrhenius was the first person to predict that emissions of carbon dioxide from the burning of fossil fuels and other combustion processes were large enough to cause global warming. In his calculation Arrhenius included the feedback from changes in water vapor as well as latitudinal effects, but he omitted clouds, convection of heat upward in the atmosphere, and other essential factors. His work is currently seen less as an accurate quantification of global warming than as the first demonstration that increases in atmospheric CO2 will cause global warming, everything else being equal.
Arrhenius's absorption values for CO2 and his conclusions met criticism by Knut Ångström in 1900, who published the first modern infrared absorption spectrum of CO2 with two absorption bands, and published experimental results that seemed to show that absorption of infrared radiation by the gas in the atmosphere was already "saturated" so that adding more could make no difference. Arrhenius replied strongly in 1901 (Annalen der Physik), dismissing the critique altogether. He touched on the subject briefly in a technical book titled Lehrbuch der kosmischen Physik (1903). He later wrote Världarnas utveckling (1906) (German: Das Werden der Welten , English: Worlds in the Making ) directed at a general audience, where he suggested that the human emission of CO2 would be strong enough to prevent the world from entering a new ice age, and that a warmer earth would be needed to feed the rapidly increasing population:
At this time, the accepted consensus explanation is that, historically, orbital forcing has set the timing for ice ages, with CO2 acting as an essential amplifying feedback. However, CO2 releases since the industrial revolution have increased CO2 to a level not found since 10 to 15 million years ago, when the global average surface temperature was up to 11 °F (6 °C) warmer than now and almost all ice had melted, raising world sea-levels to about 100 feet higher than today's.
Arrhenius estimated based on the CO2 levels at his time, that reducing levels by 0.62-0.55 would decrease temperatures by 4-5 °C (Celsius) and an increase of 2.5 to 3 times of CO2 would cause a temperature rise of 8-9 °C in the Arctic. In his book Worlds in the Making he described the "hot-house" theory of the atmosphere.
Svante Arrhenius (I859-I927), recipient of the Nobel Prize in chemistry (I903), was a declared atheist and the author of The Evolution of the Worlds and other works on cosmic physics.