3B Scientific Air Cushion Plate - Manual (Page 36)

Physical Experiments on the Air-Cushion Table
36
are oscillations, superimposed by few transla-
tions. In the solid state, the lattice elements are
arranged in a regular configuration. They per-
form oscillations around their equilibrium posi-
tion.
2.3.4 Heat Conduction in Solids
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
Space in which the Experiment surface of
behavior of the solid the air-cushion table
is observed
Adjacent lattice
Magnetic barriers
elements
Lattice elements
Hover discs
of the solid
How to proceed:
Align the air-cushion table horizontally and at-
tach the magnetic barriers. Spread the hover discs
evenly across the experiment surface.
Turn up the fan so that all hover discs are in mo-
tion. Use one finger to set one of the hover discs
located in a corner of the experiment surface into
quick oscillating motions. (Take care to avoid
damage to the experiment surface caused by fric-
tion.) Observe the motions of the hover discs.
Result:
The strong motion of the hover disc is gradually
transferred onto the other ones. The strong mo-
tion of the hover disc is gradually transferred onto
the other ones.
Interpretation:
Energy is transferred by heat conduction in sol-
ids. A rise in temperature at one place of a solid
will increase the mean kinetic energy of the lat-
tice elements at that place. Due to the forces be-
tween the lattice elements, the kinetic energy will
be transferred to the adjacent elements. This caus-
es the temperature to rise also in other places of
the solid body.