Thursday, July 23, 2009

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

http://www.youtube.com/watch?v=RwJr6Iugcrkendofvid
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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.
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