File:Radiometer 9965 Nevit.gif

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العربية: مقياس إشعاع، من طراز كروكس، وهو يُعرف أيضًا باسم الطاحونة الضوئيَّة أو المُحرِّك الشمسي، وهو عبارة عن قارورة زُجاجيَّة مُحكمة مُفرغة جُزئيًّا من الهواء. وتُوجد بداخلها أربعة زعانف مُثبتة على محور في شكل الطاحونة. وعند سقوط ضوء على الطاحونة فإنها تدور بسرعة تتناسب مع شدة الضوء. وقد شكَّل سبب الدوران موضع جدالٍ كبيرٍ بين العُلماء.
Deutsch: Eine Lichtmühle (auch als Lichtrad oder Radiometer bezeichnet) ist eine auf 5 Pa teil-evakuierte Glaskugel, in deren Innerem sich ein bewegliches Flügelrad befindet, das mit mehreren einseitig geschwärzten Plättchen versehen ist. Bei Lichteinfall beginnt sich das Rad zu drehen. Die meist dekorativen Zwecken dienende Apparatur wurde 1873 von William Crookes erfunden.
English: Radiometer. The Crookes radiometer, also known as the light mill or solar engine, consists of an airtight glass bulb, containing a partial vacuum. Inside are a set of vanes which are mounted on a spindle. The vanes rotate when exposed to light. The reason for the rotation has been the cause of much scientific debate. 640x480, 240 fps
Français : Radiomètre. Le radiomètre de Crookes, ou moulin à lumière, est une ampoule sous vide partiel dans laquelle on a disposé des aillettes montées sur un axe rotatif. Les ailettes se mettent à tourner lorsqu'on l'expose au soleil. La raison de cette rotation a été l'objet de nombreux débats scientifiques. 640x480, 240 fps
Português: Radiômetro. O radiômetro de Crookes, também conhecido como o moinho de luz ou motor solar, consiste de um bulbo de vidro hermeticamente fechado, contendo um vácuo parcial. Dentro há um conjunto de palhetas que são montadas sobre um eixo. As hélices giram quando expostas à luz. A razão para a rotação tem sido a causa de muito debate científico. 640x480, 240 fps
Türkçe: Radyometre veya Crookes radyometre. Ayrıca ışık değirmeni veya güneş motoru olarak bilinir. Kısmi bir vakum içeren, hava geçirmez bir cam ampul içinde bir mil üzerine monte edilmiş metal kanatlardan oluşur. kanatların bir yüzü siyah bir yüzü parlaktır. Kanatları ışığa maruz kaldıkça dönmeye başlar. Dönme sebebi ise pek çok bilimsel tartışmanın kaynağı olmuştur. 640x480, 240 fps
Українська: Радіометр Вільяма Крукса або «сонячний млин» у вигляді вакуумної скляної бульби з чотирма лопатями на тонкій голці усередині. Під впливом світлового тиску лопаті рухаються.
Sunda: Radiometer Crookes anu diwangun ku bohlam anu vakum parsial. Di jerona aya kolécér anu dipasang dina kumparan. Kolécérna muter lamun kasorot cahya, tapi ari marga lantaranana anu pasti mah para élmuwan ogé can sapuk. 640x480, 240 fps
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current19:11, 31 July 2010Thumbnail for version as of 19:11, 31 July 2010640 × 480 (265 KB)wikimediacommons>Nevit{{Information |Description= Radiometer |Source={{own}} |Date=2010 07 30 |Author=Nevit |Permission= |other_versions= }} Category:Electromagnetic radiation Category:Physics experiments Category:Light [[Category:Scientific equipme

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