Principle

The students should use the knowledge gained from the
experiments "Buoyancy" and "Archimedes’ principle" to be able
to construct a hydrometer.

The correlation between density and immersion depth is to be
determined in a preliminary experiment, the results of which should
be expressed as a "the - the " statement by the students.

In the experiment itself the scale of the hydrometer will be
calculated and then the density of various liquids will
be determined.