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File:02.Пиштол епрувета со алкохол.ogv

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Македонски: Опит „пиштол-епрувета“. Епруветата содржи алкохол и е затворена со тапа. Со загревање, алкохолот испарува, при што на алкохолната пара и е потребен поголем волумен од оној на течниот алкохол. Поради тоа притисокот во епруветата се зголемува до моментот кога тапата повеќе не држи и излетува од епруветата. Поинаку кажано, во моментот кога силата притисокот на алкохолната пара ќе биде поголема од силата на триење помеѓу тапата и епруветата, тапата излетува. Со оваа демонстрација се демонстрираат третиот Њутнов закон за акција и реакција, како и законот за запазување на импулсот. Експериментот е изведен и објаснет од проф. Оливер Зајков. Институт за физика на Природно-математичкиот факултет во Скопје.
English: The "Pistol Test Tube" experiment. The tube contains alcohol and is closed with a piece of cork. By heating the alcohol, the vapour fill in the space, increasing the pressure in the tube to the point of the cork popping out. In other words, when the force due to the pressure becomes greater than the friction force between the cork and the tube, the cork pops out. This demonstrates Newton's Third Law of action and reaction, as well as the Law of conservation of momentum. Performed and explained by Prof. Oliver Zajkov at the Physics Institute at the Ss. Cyril and Methodius University of Skopje, Macedonia.
Français : L'expérience du tube "pistolet".
Le tube contient de l'alcool et est fermé à son extrémité par un bouchon de liège. En chauffant l'alcool, les vapeurs de ce dernier remplissent le tube, augmentant la pression dans celui-ci au point d'en faite sauter le bouchon. Ainsi, lorsque la pression devient plus grande que les forces de frottement retenant le bouchon en place, le bouchon saute. Cette expérience permet de démontrer la troisième loi de Newton ainsi que la conservation de la quantité de mouvement.
Expérience réalisée et expliquée par le professeur Oliver Zajkov de l'Institut de physique de l'université Saints-Cyrille-et-Méthode de Skopje de Macédoine.
Română: Experimentul „pistolul-eprubetă”. Eprubeta conține alcool și este închisă cu un dop. Încălzind alcoolul, vaporii umplu spațiul, crescând presiunea din eprubetă până când dopul sare. Aceasta demonstrează legea a III-a a lui Newton, a acțiunii și reacțiunii, precum și legea conservării impulsului. Efectuat de prof. Oliver Zajkov de la Institutul de Fizică al Universității Sfinții Chiril și Metodiu din Skopje, Macedonia.
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Author Andrejdam

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