Thursday, July 23, 2009

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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Infra red images of everyday life 2

http://www.youtube.com/watch?v=3jr39mU8H8kendofvid
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Water and ice when looked at infra red camera can help us to understand how light and heat are related.
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Infra red images of everyday life

http://www.youtube.com/watch?v=Lcf9wyW_3GEendofvid
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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.
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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.
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