Science Videos
Knowledge Exchange Impact Project (KE-IP-2013/14-47)
Project Co-ordinator: Prof. A. Djurisic, Dr. W.M.Y. Cheung
Science for everyone – HKU Sci-Tube Channel
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拋物面鏡 Parabolic Mirrors
A demonstration of images formed by parabolic mirrors. Even laser rays seem to be scattered by the image. How are these effects achieved?
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拋物面鏡 Parabolic Mirrors (ppt)
Explanation of how parabolic mirrors reflect light rays and form an image. As a result, we seem to be able to observe an object at a place where it does not actually exist.
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染料敏化太陽能電池 Dye Sensitized Solar Cell (DSSC)
A demonstration of how a dye-sensitized solar cell can be made from relatively simple materials such as hibiscus tea.
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紙鍋煎蛋 Stir-frying an Egg with Paper Pan
A demonstration of stir-frying an egg with a paper pan. How come the paper pan does not burn when it is put above the fire?
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紙鍋煎蛋 Stir-frying an Egg with Paper Pan (ppt)
Explanation of why the paper pan does not burn when put close to an open fire for stir-frying an egg.
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陀螺儀 Gyroscope
A demonstration to show a feature of gyroscopic motion: a non-spinning gyroscope cannot support a mass, but can do so when it is spinning.
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陀螺儀 Gyroscope (ppt)
An explanation to the gyroscopic motion: a non-spinning gyroscope cannot support a mass, but can do so when it is spinning.
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角動量守恒 Conservation of Angular Momentum
A demonstration to show the conservation of angular momentum: When the player moves around the rotating flywheel in his hands, he himself starts to rotate as well!
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角動量守恒 Conservation of Angular Momentum (ppt)
Explanation of why conservation of angular momentum demands the demonstrator himself to rotate as well when he moves around the spinning flywheel.
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不倒的飛輪 The flywheel that does not fall
A demonstration to show a feature of gyroscopic motion: a non-spinning flywheel simply drops down when we try to pick it up from its side; the same flywheel stays upright when it is spinning.
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不倒的飛輪 The flywheel that does not fall (ppt)
Explanation of why the gyroscope does not fall down during rotational motion.
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圓周運動 Circular Motion
A demonstration of a vertical circular motion. When we revolve a ball with a rope, what role does the rope play?
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圓周運動 Circular Motion (ppt)
Explanation of force involved in a vertical circular motion.
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杯中的乒乓球 Ping-pong Ball in the Beaker
Using a hair-dryer to make a ping-pong ball revolving inside a beaker. Why doesn’t the ball fall to the ground right away when the beaker is turned upside down?
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杯中的乒乓球 Ping-pong Ball in the Beaker (ppt)
Explanation of why the ping-pong ball does not fall down when revolving rapidly inside a beaker
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總不相碰的乒乓球 Ping-pong Balls that Never Come Into Contact
Using a hair-dryer to make two ping-pong balls revolving inside a beaker. Why do the balls never come into contact with each other?
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總不相碰的乒乓球 Ping-pong Balls that Never Come Into Contact (ppt)
Explanation of why two ping-pong balls revolving inside a beaker never come into contact with each other.
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Nano-Science in the Eyes of a Chinese Philosopher Part 1
Dr. Benny Ng of the Faculty of Science explains surface tension and hydro-phobicity as observed in daily-life examples.
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Nano-Science in the Eyes of an Ancient Chinese Philosopher Part 2
Dr. Benny Ng of the Faculty of Science further discusses the use of hydro-phobicity with the use of nano-technology.
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Animation making - does Science matter?
Dr. Chi-wang Chan of the Faculty of Science explains the science behind the working of animation.
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Understanding the Science behind Coffee Art - From a Molecular Gastronomy Perspective
Dr. Jessica Leung of the Faculty of Science gives a scientific explanation of why 3D art can be made from coffee, milk and air, together with a demonstration by the chief barrister from Allegretto Viva Espresso Hong Kong.
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Hidden Order in Nature
Dr. Benny Ng from the Faculty of Science discusses mathematical order hidden in Nature, such as the Fibonacci sequence, golden ratio and fractal.
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Platonic Solids by Paper Folding
Dr. William Cheung from the Faculty of Science introduces the Platonic Solids and the importance of symmetry for science.
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Is Fish Oil our Friend or Foe?
This video discusses the hypothesis that fish oil intake is correlated with cognitive ability and homicide rate. (Conventional wisdom tells us that saturated fat is bad and unsaturated fat is good for our health, but recent studies suggest otherwise. Fish oil has long been believed to support brain health, but this may not be as robust as previously thought. This talk will provide a fundamental understanding of fat and discuss a series of fat questions -- 'can fish oil make me smart?', 'can a higher omega-3 intake lower the rate of homicide?' and more.)