..

Left: More than 3,000 years ago people weighed gold with this scale in Egypt. The metal weights had the shape of birds or a cow´s head.
Photo 2: When your grand parents were in your age they handled such scales in their toy shop to weigh the toy fruits they wanted to sell to other children.
Photo 3:  This Egyptian 25-gram two pan scale nowadays is a measuring instrument for your experiments. In the balance maker quarter of Cairos Khan El Khalili I buy such scales to sell them in Germany .
Photo 4: The metal closures of Liquemin-bottles and German Pfennig coins you will use as weights in the following experiment.
Right: A scale is like a swing for rocking on the play ground: If one child is as heavy as the other one the scale is balanced. If the child sitting on one side of the swing is too heavy it goes down and the other child goes up.
This yellow Pogemon called MEWTO on the left scale of the balance is lighter than the white one (PIKACHU) on the right scale.
Therefore 7 Liquemin weights were added to the white PIKACHU.

 .....................................................................