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
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
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