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السلام عليكم ورحمة الله وبركاته
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[ريمي]

هل لديكم ما يفيدني في مااااااااادة الفيزياء الحديثة ..

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و عليكم السلام ورحمة الله وبركاته

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إشعاع الجسم الأسود

الفيزياء المعاصرة

modern physics

[ريمي]

أختــــــــــــــــي جود ,,,
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العفو عزيزتي

وفقك الله

[شمة]

لو سمحتوا أريد معلومات عن العالم الايطالي " أميدوا أفوجادرو " بسرررعة [QUOTE]

[محمد عمر]

هذه معلومة بسيطة ممكن تفيد:
(أطلق الكيميائيون على عدد الذرات الحقيقية هوi2310i × i6.023 اسم عدد أفوجادرو Avogadro's Number . فما سبب هذه التسمية ؟
على الرغم من أن العالم الإيطالي أفوجادرو مات قبل اكتشاف هذا العدد بزمن طويل, فإن العلماء تخليداً له واعترافاً بما حقق من إنجازات في علم الكيمياء وخاصة المبدأ الهام في الحسابات الوزنية المعروف باسم " مبدأ أفوجادرو"
ونصه: تحوي الحجوم المتساوية من الغازات المختلفة نفس العدد من الجزيئات إذا كانت تحت نفس الشروط من الحراة والضغط".
استخدم الكيميائيون مصطلحاً آخر للدلالة على عدد أفوجادرو وهو مول Mole ويبدو أنه اشتق من مصطلح جزيء molecule.
إذن مول هو مرادف لعدد أفوجادرو ومدلوله العددي i2310i × i6.023 من الدقائق سواء أكانت هذه الدقائق ذرات أو جزيئات , فمثلاً مول من ذرات الفضة يعني عدداً مقدراه --------- ذرة حقيقية من ذرات هذا العنصر, ومول من جزيئات O2 يعني عدداً مقدراه------- من جزيئات الأوكسجين O2 الحقيقية.)
المصدر: المدرسة العربية

[محمد عمر]

This information may help you :
(Amadeo Avogadro was an Italian scientist noted to be one of the founders of physical chemistry. He was actually a physics professor but he experimented in both physics and chemistry using mathematics to base most of his findings. Avogadro is well known for his hypothesis known as Avogadro's Law. His law simply states that at a fixed temperature and pressure, equal volumes of gases contain the same number of molecules.

Avogadro received no recognition for his hypothesis or his constant during his lifetime because he was not considered as a brilliant experimenter but rather, a careless one. He also did not back up his hypothesis with an impressive display of experimental results. He also did not have an impressive reputation for accurate experimental work. Another reason why his hypothesis was not recognized was because of the fact that his work was published in obscure journals and maybe because he was very isolated from the mainstream of chemistry done in his time.

Avogadro's work was recognized nearly fifty years after he had made his hypothesis. Two years after his death, a colleague, Stanislao Cannizzaro (1826-1910) showed how the use of Avogadro's number could solve many of the problems in chemistry. This time Avogadro's paper was looked at more carefully over a wider and more distinguished group of scientists, thus his work was finally recognized. Avogadro's work helped other scientists to solve more problems and develop more theories. The number 6.02214199 x 10^23 is called Avogadro's number NA, in honor of Amadeo Avogadro, who was the first person to argue in favor of the existence of atoms.

Avogadro has based his work on the findings of Joseph Gay-Lussac in 1809. Gay-Lussac had discovered that all the gases when subjected to an equal rise in temperature, expand by the same amount. Avogadro therefore derived his hypothesis. He also made it clear that the gas particles need not be individual atoms but had made a distinction between the atoms of a substance and its molecules.

Avogadro himself was born on June 9, 1776 in Turin, Italy. He began his career in 1796 by obtaining a doctorate in law and practicing as a lawyer for three years after. In 1800, he began to take private lessons in mathematics and physics and decided to make the natural sciences his profession. He was appointed as a demonstrator at the Academy of Turin in 1806 and the Professor of Natural Philosophy at the College of Vercelli in 1809, and in 1820, he was appointed the professor of mathematical physics. Avogadro died on July 9, 1856 in Turin, Italy. )
source:http://www.moleday.org/htdocs/avogadro.html
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