Sunday, July 12, 2009

Build a little hot air balloon: the tea bag experiment



Using a simple tea bag is possible make a little hot air balloon, see the video instructions.
The fire heat the air inside the balloon, hot air is less dense than cold air, result: a buoyancy force greater than the weight will make the balloon fly.

Reaction between sugar and concentrated sulfuric acid produces coal


The concentrated sulfuric acid can take the water out of the sugar molecule producing coal plus water according to reaction equation:
C12H22O11(s) → 12 C(s) + 11 H2O(aq)
That is a exothermic process and liberates poison's vapors, then take care and use one appropriated place , don’t do it indoors!

Classic Science Experiments: Egg in a Bottle


Classic Science Experiments: Egg in a Bottle
You will need: a egg, an empty milk bottle and some matches

The match warm the air inside the bottle
the air become less dense and go out. Since the egg close the bottle, the air inside cool and the inner pressure reduce. Thus the atmosphere pressure push the egg.

Homemade Small Robot


Using a tooth brush and a old cell phone engine you can built a small robot.
The eccentric axis generates the vibrations that keep the robot running.
Is also possible use a electric engine normally found in toys and a large brush.
For more instructions see: http://www.evilmadscientist.com/article.php/bristlebot
Saturday, July 11, 2009

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