Dasymeter

The Dasymeter, also called Baroskop, air balance or Waagemanometer, is a device for demonstrating the buoyancy of objects in air. It was invented in 1650 by Otto von Guericke.

Construction

The Dasymeter consists of a beam balance, on the on the one hand, a larger body with a low density (for example, a hollow glass body), and on the other hand a small body with a high density (for example, a lead weight ) is fixed. Mass and volume of the two bodies are chosen so that the beam balance is in air ( at atmospheric pressure) in balance. The Dasymeter is, however, in an evacuated vessel, so it leans to the side of the great body.

Physical explanation

The body with the larger volume learns according to Archimedes' principle in the air greater buoyancy than the body with the small volume. In a vacuum, this lift is, however, no longer exists, so that the beam balance tilts to the side of the great body.

• Classical Mechanics