Thursday, July 23, 2009

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
Wednesday, July 22, 2009
Tuesday, July 21, 2009

Egg in a Bottle Science Trick

Follow the instructions and learn the classic and fantastic science trick: “Egg in a Bottle"
The hot air inside the bottle cools down reducing the inner pressure, thus the atmospheric pressure will push the egg.

Postagens populares