Thursday, July 23, 2009

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

The effect of a polarizer on a rainbow light

Your Text description. Fill it Or leave it blank.

Interesting phenomena, I didn’t know that rainbow light was polarized

Make at home one Wilson's machine

"An early electrostatic influence machine, invented by Wilson in 1804. A ball electroscope observes the output voltage."
From: youtube description video

Music from a straw and a chicken in a cup

Science bob explain quickly how to produce sounds from a straw and how to make a chicken voice using a plastic glass.

The magic of polyurethane foam: polyol and isocyante
This videos shows how polyurethane foam is made, you need just mix together the polyol and the isocyanete. A chemical reaction will happen and the total volume will grow up 30 times the original size.

Is possible to boil water inside a balloon?
Find out how the materials absorb heat and the relation between heat and temperature for different materials.

Simple way to build an electrical motor
Instead of these materials you can use a simple magnet from speakers, paper clips and adhesive type to build your own electrical motor.

Different kind of electrical engine
This video shows a different kind of electrical engine, it uses two coils as electrical magnets to attract, alternately, a piece of iron and generates movement.

Infra red images of everyday life 2
Water and ice when looked at infra red camera can help us to understand how light and heat are related.

Infra red images of everyday life
Infra red light can be thought of as “heat”
The warmer something is, the more brightly it glows in the infrared.
Apiece of glass may be bright, but it is cool, so it will appear black in the infra red camera.
Even though a person may stand in shadows her body heat shines in the infrared.

The huge shadow called eclipse

What causes an eclipse of the moon?
An eclipse is nothing more than a shadow, actually a huge shadow. Don’t believe on me? What this video and learn more about eclipses and our natural satellite, the moon.

Why doesn't the moon falls down on earth? Actually it falls!

Have you asked for yoursel why doesn't moon falls on earth? Watch this video and find out that actually it is falling, all the time.

Have you ever thought why there aren’t green stars?
Have you ever thought why there aren’t green stars?
Looking to the sky at night we can identify some red stars, yellow stars and blue stars indeed, we’ll never see a green star.
Watch this video and find out the answer.

Stellar evolution video: how stars live and die

What a star really is? How matter ( gas and dust) collapse by the gravity force?
What is the end of a star?
You can find the answers for these questions and much more information about the stars evolutions on this video.

What makes the sky blue?

Play baseball with molecules and learn what makes the sky blue or sometimes red!

The effects of solar winds

This video shows the effects of solar winds on earth, the hazards, boreal aurora and the earth's magnetic field protection against solar particles

Marshmallows in a vacuum chamber

Marshmallows contains air inside, the vacuum will reduce the inner pressure and make the air inside the marshmallows expand, thus the marshmallows grow up.

Fishing ice cubes

Using science principles this video shows how to fish an ice cube.

Nitric Acid and a Penny

When we put a penny in a flask containing nitric acid a chemical reaction happens, liberating nitrogen dioxide as a gas.

"Warning: Do not attempt this reaction. The gases produced are dangerous and must be properly controlled and ventilated. Also, the concentrated nitric acid used can cause severe acid burns.

If you've been keeping up, you know that we already popped a small balloon, but our intention all along was to go big. After purchasing larger balloons, we did a test run... and it was still essentially a flop. In this experiment, we use a snazzy apparatus with dual layered balloons to combat the corrosive nature of the Nitrogen Dioxide gas (and it really is corrosive).

The liquid in the first flask is concentrated Nitric Acid. When we placed a number of pennies in the flask, the acid reacted with the copper and released the nitrogen dioxide. The blue color in the copper solution is due to the copper ions.

You will notice a sort of double pop, and that is due to our double balloon layer. Contrary to popular belief, it is not magic.

If you're observant, you will also notice just how corroded the popped balloons did get. And, if you can take your eyes away from the balloons and smoke, check out the blue acid solution boiling in the foreground.

The overall after hours reaction should be considered a success, and hopefully you will find our diligent and persistent work to be enjoyable :)"
From: GWNProductions youtube channel

conducting glass

Click here to see how a piece of glass can become a electrical conductor.

"A small glass tube, held by copper wire, is placed in series with a light bulb. The glass acts as an insulator at room temperature, meaning the current cannot flow between the copper wires. This leaves an open circuit and the light bulb does not light up. Touching a conductor across the copper wires (with a metal screwdriver for instance) does complete the circuit because it allows current to flow.

However, when glass is sufficiently heated by a torch it becomes an ionic conductor. Ionic bonds in the glass are broken, allowing the charge carrying ions to move freely. Thus, when the glass is melted the current can flow, which closes the circuit and lights the bulb.
See the original video on MIT TechTV -"
From: MIT youtube channel

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