3B Scientific Air Cushion Plate - Handbuch (Seite 86)

35
Physical Experiments on the Air-Cushion Table
Model simulation
Real object Model
Vessel containing Experiment surface of
the gas the air-cushion table
Walls of the vessel Magnetic barriers
Piston in the vessel Magnetic piston
Gas molecules Hover discs
How to proceed:
Align the air-cushion table horizontally and attach
the magnetic barriers. Place the piston close to
barrier no. 2. Attaching the guide piece for the
magnetic piston ensures excellent guidance of the
piston rod. Place the hover discs on the
experiment surface so that they are located near
barrier no. 1.
Turn up the fan so that all hover discs are sure to
lift off. Shift the piston very slowly from barrier
no. 2 towards barrier no. 1 until the piston has
crossed the center of the experiment surface.
Observe the motions of the hover discs.
Result:
At first, the hover discs perform the same motions
as the molecules of a gas. The smaller the
available area becomes, the stronger the
impediment of the translational movements. In
addition, there are oscillations of the hover discs
around their respective location.
The hover discs change their equilibrium position
less often with time. Finally, each disc is located
in a fixed position around which it performs
oscillating and circular motions.
Result:
Initially, the hover discs are arranged regularly
and perform oscillating and circular motions
around their respective location. Then the
amplitudes of their oscillations increase.
Individual discs change their position. In the end,
all discs temporarily perform translational
movements in addition to the oscillations.Result:
Initially, the hover discs are arranged regularly
and perform oscillating and circular motions
around their respective location. Then the
amplitudes of their oscillations increase.
Individual discs change their position. In the end,
all discs temporarily perform translational
movements in addition to the oscillations.
Interpretation:
A rise in temperature will make a solid body melt.
While initially all lattice elements are bound to a
fixed position around which they oscillate, there
will be a subsequent superimposition of the os-
cillations and translational movements.
2.3.3 Change of the Aggregation State of a
Gas through Compression and Cooling
Components:
Air-cushion table with fan
Overhead projector
Magnetic barrier, long
2 Pieces
Magnetic barrier, short 2 Pieces
Magnetic piston 1 Piece
Guide piece for the 1 Piece
magnetic piston
Hover disc, red
21 pieces