Des plaques d’égouts japonaises. Au Japon les plaques qui recouvrent les bouches d’égouts sont souvent décorées et peintes avec des motifs représentant une spécialité de la ville où elles sont installées ou rendent hommage aux personnels qui les utilisent. ( Via ) Tracez une ligne. La catastrophe de l’Hindenburg. Mike, le poulet sans tête. Comment démarrer un avion de ligne. Les expressions électriques du visage par Duchenne de Boulogne. 2 façons d’arrêter les chutes du Niagara. Quand la Terre était le centre de l’univers. L’expérience scientifique en cours la plus longue. The Pitch Drop Experiment | School of Mathematics and Physics. We're home to the famous Pitch Drop experiment, which holds the Guinness World Record for the longest-running laboratory experiment.
The experiment demonstrates the fluidity and high viscosity of pitch, a derivative of tar that is the world's thickest known fluid and was once used for waterproofing boats. Thomas Parnell, UQ's first Professor of Physics, created the experiment in 1927 to illustrate that everyday materials can exhibit quite surprising properties. At room temperature pitch feels solid - even brittle - and can easily be shattered with a hammer. But, in fact, at room temperature the substance - which is 100 billion times more viscous than water - is actually fluid. The experiment explained In 1927 Professor Parnell heated a sample of pitch and poured it into a glass funnel with a sealed stem.
Since then, the pitch has slowly dripped out of the funnel - so slowly that it took eight years for the first drop to fall, and more than 40 years for another five to follow. Related links.