Archimedean Principle

Now you dip the metalpiece (still hanging on the spring force meter) into the glass which is filled up to the brim with water. Now the following can be noticed (see picture below):

• The metalpiece has got a certain volume (spatial capacity). If this volume is dipped into the full glass of water, the same volume of water in the glass will be displaced. The water overflows and is absorbed by the weighing pan.
• The spring force meter now only shows 6 sections, this corresponds to a mass of 120 g. Because of the dipping into the water the metalpiece weighs 60 g "less" than before! But this means that in the water there is an impact of an upward force on the dipped body. We call this force "buoyancy".

Now the mass of the water, which has overflown during the dipping of the metalpiece, is determined (it is in the weighing pan and can be weighed simply).