This phenomenon is one of the daily phenomena that has not been clearly explained at present, and its industrial value is very great. The experiment has strong operability, easily available materials and good data separation.

1, the particle size and shape, surface smoothness of the two kinds of particles are given, and the apparent density (measured directly with a cup) and real density (measured by drainage method) of the two kinds of particles are measured.

2, you can try to experiment in different liquids.

3. If possible, try the experiment under sealed conditions and change the internal air pressure.