3B Scientific Air Cushion Plate - Manual (Page 28)

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Physical Experiments on the Air-Cushion Table
2.2 Structure and Properties of the Liquids
on between the other discs.
The kinetic energy differs from disc to disc and
changes from time to time in each disc.
The hover discs are irregularly arranged at short
distances. Each hover disc performs oscillating
and circular motions around its location.
However, it is not bound to any specific location,
rather changing it at irregular intervals or moving
on between the other discs.
The kinetic energy differs from disc to disc and
changes from time to time in each disc.
Interpretation:
The molecules of a liquid are in permanent, irre-
gular motion, with prevailing oscillating and cir-
cular motions around the respective location. In
almost every molecule these motions are tem-
porarily superimposed by irregular translatio-
nal movements. The kinetic energy of the indivi-
dual molecules varies and is constantly changing.
2.2.2 Increase of Temperature in Liquids
when Supplying Energy
Components:
Air-cushion table with fan
Overhead projector
Magnetic barrier, long
2 Pieces
Magnetic barrier, short 2 Pieces
Hover disc, orange 25 Pieces
Model simulation
Real Object Model
Vessel containing Experiment surface of
the liquid the air-cushion table
Walls of the vessel Magnetic barriers
Molecules of the Hover discs
liquid
How to proceed:
Align the air-cushion table horizontally and attach
the magnetic barriers. Place the hover discs on
the experiment surface.
Turn the fan to setting in which the hover discs
are sure to lift off. Initially, the velocity of the
hover discs has to be kept low by briefly opening
the impulse valve at rather long intervals.
Gradually increase the velocity by opening the
valve at shorter intervals. Observe the motion of
the hover discs.
2.2.1 Configuration and Motion of Molecules
in a Liquid
Components:
Air-cushion table with fan
Overhead projector
Magnetic barrier, long
2 Pieces
Magnetic barrier, short 2 Pieces
Hover disc, orange 25 Pieces
Model simulation
Real Object Model
Vessel containing Experiment surface of
the liquid the air-cushion table
Walls of the vessel Magnetic barriers
Molecules of the Hover discsHover discs
liquid
How to proceed:
Align the air-cushion table horizontally. First
place the magnetic barriers on the experiment
surface and next the hover discs.
Turn the fan to a setting in which the hover discs
are sure to float even when the impulse valve is
opened. Briefly open the impulse valve several
times so that the mean velocity of the discs is as
high as possible.
Observe the arrangement and motion of the hover
discs.
Result:
The hover discs are irregularly arranged at short
distances. Each hover disc performs oscillating
and circular motions around its location.
However, it is not bound to any specific location,
rather changing it at irregular intervals or moving