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1 Haber, Fritz
SUBJECT AREA: Chemical technology[br]b. 9 December 1868 Breslau, Germany (now Wroclaw, Poland)d. 29 January 1934 Basel, Switzerland[br]German chemist, inventor of the process for the synthesis of ammonia.[br]Haber's father was a manufacturer of dyestuffs, so he studied organic chemistry at Berlin and Heidelberg universities to equip him to enter his father's firm. But his interest turned to physical chemistry and remained there throughout his life. He became Assistant at the Technische Hochschule in Karlsruhe in 1894; his first work there was on pyrolysis and electrochemistry, and he published his Grundrisse der technischen Electrochemie in 1898. Haber became famous for thorough and illuminating theoretical studies in areas of growing practical importance. He rose through the academic ranks and was appointed a full professor in 1906. In 1912 he was also appointed Director of the Institute of Physical Chemistry and Electrochemistry at Dahlem, outside Berlin.Early in the twentieth century Haber invented a process for the synthesis of ammonia. The English chemist and physicist Sir William Crookes (1832–1919) had warned of the danger of mass hunger because the deposits of Chilean nitrate were becoming exhausted and nitrogenous fertilizers would not suffice for the world's growing population. A solution lay in the use of the nitrogen in the air, and the efforts of chemists centred on ways of converting it to usable nitrate. Haber was aware of contemporary work on the fixation of nitrogen by the cyanamide and arc processes, but in 1904 he turned to the study of ammonia formation from its elements, nitrogen and hydrogen. During 1907–9 Haber found that the yield of ammonia reached an industrially viable level if the reaction took place under a pressure of 150–200 atmospheres and a temperature of 600°C (1,112° F) in the presence of a suitable catalyst—first osmium, later uranium. He devised an apparatus in which a mixture of the gases was pumped through a converter, in which the ammonia formed was withdrawn while the unchanged gases were recirculated. By 1913, Haber's collaborator, Carl Bosch had succeeded in raising this laboratory process to the industrial scale. It was the first successful high-pressure industrial chemical process, and solved the nitrogen problem. The outbreak of the First World War directed the work of the institute in Dahlem to military purposes, and Haber was placed in charge of chemical warfare. In this capacity, he developed poisonous gases as well as the means of defence against them, such as gas masks. The synthetic-ammonia process was diverted to produce nitric acid for explosives. The great benefits and achievement of the Haber-Bosch process were recognized by the award in 1919 of the Nobel Prize in Chemistry, but on account of Haber's association with chemical warfare, British, French and American scientists denounced the award; this only added to the sense of bitterness he already felt at his country's defeat in the war. He concentrated on the theoretical studies for which he was renowned, in particular on pyrolysis and autoxidation, and both the Karlsruhe and the Dahlem laboratories became international centres for discussion and research in physical chemistry.With the Nazi takeover in 1933, Haber found that, as a Jew, he was relegated to second-class status. He did not see why he should appoint staff on account of their grandmothers instead of their ability, so he resigned his posts and went into exile. For some months he accepted hospitality in Cambridge, but he was on his way to a new post in what is now Israel when he died suddenly in Basel, Switzerland.[br]Bibliography1898, Grundrisse der technischen Electrochemie.1927, Aus Leben und Beruf.Further ReadingJ.E.Coates, 1939, "The Haber Memorial Lecture", Journal of the Chemical Society: 1,642–72.M.Goran, 1967, The Story of Fritz Haber, Norman, OK: University of Oklahoma Press (includes a complete list of Haber's works).LRD -
2 etwa
Adv.1. (in) etwa (ungefähr) about, approximately, around umg.; nachgestellt: or so, or thereabouts; in etwa fertig etc.: more or less; wann etwa? approximately when?; (um wie viel Uhr?) auch around what time? umg.; wie viel etwa? about how much?; wie macht man das? - etwa so oder so etwa something like this2. (zum Beispiel) for instance, for example, (let’s) say; denken sie etwa an... think, for example, of...; viele Vögel, wie oder so etwa die Amsel,... many birds, like ( oder such as) the blackbird for instance3. (vielleicht) by any chance, possibly; war sie etwa da? was she there by any chance?; glaubst du das etwa? do you really believe that?, you don’t believe that, do you?; ist das etwa besser? zweifelnd: is that any better?; ist das etwa nichts? herausfordernd: isn’t that something?, what do you think of that then?; das stimmt doch, oder etwa nicht? surely that’s right - or is it? ( oder - or do you think not?)4. nicht etwa verstärkend: surely; not that; du warst doch nicht etwa da? you weren’t there, were you?, don’t tell me you were there; nicht etwa, dass es etwas ausmachen würde, aber... not that it matters, but...; du glaubst doch nicht etwa...? surely you don’t think...?5. gegenüberstellend: sie ist nicht etwa faul, ( sondern) nur langsam she’s not lazy, just slow; es war nicht etwa gestern, sondern vorgestern it wasn’t yesterday but the day before* * *approximately; about; around; roundabout; peradventure* * *ẹt|wa ['ɛtva]advso etwa, etwa so — roughly or more or less like this
wann etwa...? — about or approximately or roughly when...?
2) (= zum Beispiel) for instancewenn man etwa behauptet, dass... — for instance if one maintains that...
3)hast du etwa schon wieder kein Geld dabei? — don't tell me or you don't mean to say you haven't got any money again!soll das etwa heißen, dass...? — is that supposed to mean...?
willst du etwa schon gehen? — (surely) you don't want to go already!
4)das haben Sie wohl nicht mit Absicht gesagt, oder etwa doch? — surely you didn't say that on purpose, you didn't say that on purpose - or did you?
sind Sie etwa nicht einverstanden? — do you mean to say that you don't agree?
ist das etwa wahr? — (surely) it's not true!, (surely) it can't be true!
5)(in Gegenüberstellung, einschränkend)
nicht etwa, dass... — (it's) not that...er ist nicht etwa dumm, sondern nur faul — it's not that he's stupid, he's simply lazy
* * ** * *et·wa[ˈɛtva]I. adv1. (ungefähr, annähernd) aboutin \etwa more or lessso \etwa [o \etwa so] roughly [or more or less] like thisso \etwa könnte es passiert sein it could have happened roughly like this2. (zum Beispiel) for instancewie \etwa mein Bruder like my brother for instanceII. part1. (womöglich)ist das \etwa alles, was Sie haben? are you trying to tell me [or do you mean to say] that's all you've got?soll das \etwa heißen, dass...? is that supposed to mean [that]...?willst du \etwa schon gehen? [surely] you don't want to go already!das haben Sie wohl nicht mit Absicht gesagt, oder \etwa doch? you didn't say that on purpose — or did you?bleibst du nun hier oder kommst du \etwa doch mit? do you want to stay here, or are you coming after all?2. (Verstärkung der Verneinung)ist das \etwa nicht wahr? do you mean to say it's not true?* * *1.1) (ungefähr) about; approximatelyetwa so groß wie... — about as large as...
2) (beispielsweise) for example; for instancevergleicht man etwa... — for example, if one compares...
2.wie etwa... — as, for example...
Partizip (womöglich)hast du das etwa vergessen? — you haven't forgotten that, have you?
störe ich etwa? — am I disturbing you at all?
* * *etwa adv1.in etwa fertig etc: more or less;wie viel etwa? about how much?;wie macht man das? -so etwa something like this2. (zum Beispiel) for instance, for example, (let’s) say;denken sie etwa an … think, for example, of …;viele Vögel, wie oderso etwa die Amsel, … many birds, like ( oder such as) the blackbird for instance3. (vielleicht) by any chance, possibly;war sie etwa da? was she there by any chance?;glaubst du das etwa? do you really believe that?, you don’t believe that, do you?;ist das etwa besser? zweifelnd: is that any better?;ist das etwa nichts? herausfordernd: isn’t that something?, what do you think of that then?;das stimmt doch, oder etwa nicht? surely that’s right - or is it? ( oder - or do you think not?)4.nicht etwa verstärkend: surely; not that;du warst doch nicht etwa da? you weren’t there, were you?, don’t tell me you were there;nicht etwa, dass es etwas ausmachen würde, aber … not that it matters, but …;du glaubst doch nicht etwa …? surely you don’t think …?sie ist nicht etwa faul, (sondern) nur langsam she’s not lazy, just slow;es war nicht etwa gestern, sondern vorgestern it wasn’t yesterday but the day before* * *1.1) (ungefähr) about; approximatelyetwa so groß wie... — about as large as...
2) (beispielsweise) for example; for instancevergleicht man etwa... — for example, if one compares...
2.wie etwa... — as, for example...
Partizip (womöglich)hast du das etwa vergessen? — you haven't forgotten that, have you?
* * *adj.about adj. adv.approximately adv.perhaps adv.
См. также в других словарях:
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