Plasticine learns how to swim
Fill 3/4 of the glass with water. Now take the plasticine and shape a floating hollow body (see picture above) which still fits in the glass.
Mark the water level with your coloured pen on the glass.
Take the plasticine figure out of the glass and form a ball again.
Take a look at the mark you have drawn on the glass.
If you put the ball in the glass, the water level is …