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Dirk Waldeck
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Burning Iron in Liquid Oxygen

Dropping a piece of burning iron wool into liquid oxygen produces a violent chemical reaction. Almost all of the iron is consumed in the exothermic reaction with oxygen to produce a mixture of iron oxides. The small pieces of iron particulates glow brightly as the reaction proceeds.

The reaction is a little contradictory since liquid oxygen is extremely cold (-186°C) and the burning metal is extremely hot. One would expect the metal to cool upon coming into contact with the liquid yet in reality it actually heats up as the reaction begins.

Source: https://youtu.be/6NNt0Pup6jU

#ScienceGIF #Science #GIF #Iron #Oxygen #LiquidOxygen #Liquid #Burning #Chemistry #Physics #Periodic
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Homopolar Motor

The homopolar motor is the simplest electric motor that uses direct current to power rotational movement. It was first built and demonstrated by Michael Faraday in 1821 at the Royal Institute in London. The name "homopolar" is used because the polarity of the magnetic field emitted by the conductor and the permanent magnets does not change (unlike conventional DC motors).

The resulting rotational movement of the copper conducting wire is caused by the Lorentz force. A conductor (the wire) with a current flowing through it (from the battery) that is placed in a magnetic field (from the magnet) perpendicular to the current experiences a force in the direction perpendicular to both the magnetic field and current. This force provides torque around the axis of rotation and causes the conducting wire to spin.

Put more technically, the Lorentz force is the combination of electric and magnetic force on a point charge. If a particle with charge q moves with velocity v in the presence of electric field E and a magnetic field B, then it will experience the force F = qE + qv x B.

Source: https://youtu.be/wUqbvHOW6Us

#ScienceGIF #Science #GIF #Motor #Physics #Magnetism #Magnetic #Magnet #Battery #Electricity #Electromagnetism #EM #Cooper #Wire #Polar #Polarity
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Bullet vs. Glass

Prince Rupert's Drops are beads of toughened glass created by dipping molten glass into cold water, which causes it to solidify into a tadpole-shaped droplet. As the glass cools from the outside in, it produces significant compressive stresses on the surface and tensile stresses at the core of the drop. The spherical shape of the bulbous head gives the glass enormous strength, such that it can be struck with a hammer without breaking. However, the tail is extremely fragile and causes the entire droplet to explosively shatter when cracked.

The +SmarterEveryDay​​ YouTube channel has a series of videos examining the behavior of Prince Rupert's Drops using high-speed cameras. Here a .38-caliber bullet can be seen disintegrating upon impact with the head of the droplet without damaging the glass.

Source: https://youtu.be/F3FkAUbetWU (Smarter Every Day)

#ScienceGIF #Science #GIF #Glass #Bullet #Impact #Stress #Mechanical #Strength #Stress #Molten #Drop #Droplet #PrinceRupert #HighSpeed #Camera #SmarterEveryDay 
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Life Saver Triboluminescence

Triboluminescence is an optical phenomenon that generates light through the breaking of chemical bonds in a material when it is pulled apart, ripped, rubbed, scratched, or crushed (fractoluminescence). An exact understanding of how the process works has yet to be established. The current theory involves electrical charge separation that results in ionization of the surrounding air, which produces the flash of light.

Mint-flavored Life Saver candies are an easy way to visualize this phenomenon with the naked eye. Crushing them with a hammer (or your teeth) in a dark room will generate bright blue sparks. This light is actually generated by a two-step process involving fluorescence, which is the emission of light by a substance that has absorbed another wavelength of light. The light released by triboluminescence is ultraviolet and therefore invisible to the human eye. However, the wintergreen oil used in mint flavoring is fluorescent, and converts the invisible ultraviolet light into visible blue light.

I highly recommend watching the source video from +SmarterEveryDay to see more slow motion footage of Life Savers being hammered and shot with a pellet gun.

Source: https://youtu.be/tW8q_JfmcbU (Smarter Every Day)

#ScienceGIF #Science #GIF #Triboluminescence #Light #Luminescence #Mechanical #Chemical #Bond #Photons #Energy #HighSpeed #SlowMotion #SlowMo #LifeSaver #Lightning #SmarterEveryDay
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Le Cosmos de Star Wars

Eight beautiful silhouette pieces based on The Clone Wars. Art by Sébastien Del Grosso (goo.gl/UkiuSK)
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Top-10 Star Wars art of October 2016:
lightsabr.net/2016/11/star-wars-art-best-october-2016

Yesterday's art: plus.google.com/+RaymondMendiolaIV/posts/gL47QKdHRLf

#StarWars #TheCloneWars #PrequelTrilogy
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Le Cosmos de Star wars
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Yyyyaaaaaassssssssssss!!!
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