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Cabri Geometry II Plus (Free-Trial Version)

CABRI is an educational program that aims to make the pupil acquire the principles of Euclidean geometry starting from the fundamental properties of a figure.

teachers together with students, they can also use CABRI to explore some of the features of a polygon or other geometric shape.

DOWNLOAD CABRI II PLUS

Images Software:

Wedding Arches Of Bamboo Sticks

The surface tension of water

Required materials: glass, water, coins of 5 cents
Method: Put water in the glass doing is getting filled to the brim Then gently lay on the bottom of the glass coins

Here is the result

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A reaction between the lime and citric acid in the soil

Needed : a glass with the opaque background because of the limestone encrusted lemon contains citric acid.

procedure : it takes the glass, tips and press a bit on the bottom 'of lemon juice. He expects about ten minutes and you see the formation of a slight effervescence, in the end the limestone disappears and the glass is more transparent.

Explanation : the limestone is not more because the citric acid content in lemon juice reacted it producing carbon dioxide, the gas has resulted in the formation of small bubbles.

The same reaction occurs when using scaling sold on the market, which also contain the strongest acid citric acid to make the shiny steel of the taps, or the pots of porcelain Toilet.

photos experiment

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Text and photos by Vincent Dello Stritto