Thursday, July 23, 2009

The effect of a polarizer on a rainbow light

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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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Is possible to boil water inside a balloon?

http://www.youtube.com/watch?v=gjUFTiHYN5kendofvid
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Find out how the materials absorb heat and the relation between heat and temperature for different materials.
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Simple way to build an electrical motor

http://www.youtube.com/watch?v=rOib92FriZYendofvid
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Instead of these materials you can use a simple magnet from speakers, paper clips and adhesive type to build your own electrical motor.
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Different kind of electrical engine

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