Saturday, December 12, 2009
The smoke inside the bottle falls becouse it is cold. Otherwise it ascend with the warm air as we always see.
Physics demonstration of Pascal principle using plastic bottles
Falling Smoke
The smoke inside the bottle falls becouse it is cold. Otherwise it ascend with the warm air as we always see.
Pascal Principles and plastic bottles
Physics demonstration of Pascal principle using plastic bottles
Tuesday, December 8, 2009
Monday, August 31, 2009
Make a rainbow over your hands
This book uses the same principle of a flip book to give us the visual sensation of a rainbow.
The way in which a real rainbow is formed is very different. In the sky the colors are formed by the decomposition of white light inside of little particles of water that make the clouds.
Here a strep with some colors of rainbow is placed in each page of the book, when we flip it the rainbow appears. A phenomena called visual persistence allows that, to see more about visual persistence click here.
The way in which a real rainbow is formed is very different. In the sky the colors are formed by the decomposition of white light inside of little particles of water that make the clouds.
Here a strep with some colors of rainbow is placed in each page of the book, when we flip it the rainbow appears. A phenomena called visual persistence allows that, to see more about visual persistence click here.
Tuesday, August 11, 2009
Leidenfrost Effect: putting the finger inside molten lead
This video show the physical principle that allows put the finger inside a molten lead without burn it.
The humidity of ours skin evaporates and the molten lead do not touch the finger.
The same happens with water drops in contact with a very hot frying pan . They don’t evaporate immediately because a vapor layer protects the drop from the heat.
The humidity of ours skin evaporates and the molten lead do not touch the finger.
The same happens with water drops in contact with a very hot frying pan . They don’t evaporate immediately because a vapor layer protects the drop from the heat.
Saturday, August 8, 2009
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Learn how to do a sodium dichromate volcano
Sodium dichromate is a orange solid. During its decomposition N2 , water and chrome oxide are liberated. The total volume increase in about 30 times. Some chrome oxide dust and the heat liberated make it really seamed with a true volcano.
Thursday, July 23, 2009
Paul hewitt demos, using humor, inertia and physics pulling a tablecloth out from under a table full of plates and glasses and not moving or breaking anything.
The journey for creation of light bulb is shown on this video.
"This is a collection of experiments using a Van de Graaff generator.
The generator uses a belt and two rollers to build up a charge in the dome on top. The electrons will jump from the dome to reach a grounded object. Since like charges repel one another, objects placed on top of the dome will become charged and then be repelled.
This is the same machine sometimes used to make someone's hair stand up in classrooms or in science centers."
From: You tube descripion video
Oil is a very precious natural resource; this video shows how oil is stored in a trap formed by tectonics forces.
Pyrolytcs graphite is a diamagnetic material, which means that a magnetic field will be repelled by this material. Thus the magnet floats
A simple science trick you can do at home, using two rubber bands and a CRT TV screen. The TV screen works as a stroboscopic light, and when the frequency of rubber band is near the TV vertical frequency the rubber band seems to moving in slow motion.
"A single seed crystal was added to the saturated sodium Acetate solution while at 30C. Omnidirectional needle-like crystals radiated outward from the seed on contact at the solution's surface."
From: youtube video description
"This is a demonstration called the rubber band heat engine. As the name suggests, you take rubber bands, apply heat to them and they do work for you... just not terribly much of it. But its interesting nonetheless."
From: youtube video description
Using some sugar, NaOH, and KMnO4 is easy to prepare a rainbow juice. The KMnO4 is reducing and changing the flask color.
This is a very useful invention that can help a lot, this mechanism may save some fingers stopping immediately the saw.
The creator of machine will test the efficiency of his invention, the saw will stop? See for your self
The old tablecloth trick by Paul Hewitt
Paul hewitt demos, using humor, inertia and physics pulling a tablecloth out from under a table full of plates and glasses and not moving or breaking anything.
The light bulb history may inspire you
The journey for creation of light bulb is shown on this video.
Collection of experiments using a Van de Graaff generator
"This is a collection of experiments using a Van de Graaff generator.
The generator uses a belt and two rollers to build up a charge in the dome on top. The electrons will jump from the dome to reach a grounded object. Since like charges repel one another, objects placed on top of the dome will become charged and then be repelled.
This is the same machine sometimes used to make someone's hair stand up in classrooms or in science centers."
From: You tube descripion video
Geology formation of a basin trap oil
Oil is a very precious natural resource; this video shows how oil is stored in a trap formed by tectonics forces.
Magnet levitates in a plate of pyrolytcs graphite
Pyrolytcs graphite is a diamagnetic material, which means that a magnetic field will be repelled by this material. Thus the magnet floats
Slow-motion Rubber Band Trick: that is Amazing!
A simple science trick you can do at home, using two rubber bands and a CRT TV screen. The TV screen works as a stroboscopic light, and when the frequency of rubber band is near the TV vertical frequency the rubber band seems to moving in slow motion.
Sodium Acetate Slow Crystalization
"A single seed crystal was added to the saturated sodium Acetate solution while at 30C. Omnidirectional needle-like crystals radiated outward from the seed on contact at the solution's surface."
From: youtube video description
Thermal rubber band machine
"This is a demonstration called the rubber band heat engine. As the name suggests, you take rubber bands, apply heat to them and they do work for you... just not terribly much of it. But its interesting nonetheless."
From: youtube video description
Rainbow Juice using Sugar, KMnO4 and NaOH
Using some sugar, NaOH, and KMnO4 is easy to prepare a rainbow juice. The KMnO4 is reducing and changing the flask color.
An invention that can save a life, or some fingers
This is a very useful invention that can help a lot, this mechanism may save some fingers stopping immediately the saw.
The creator of machine will test the efficiency of his invention, the saw will stop? See for your self
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