XGAS(1)XGAS(1)NAMExgas - animated simulation of an ideal gas
SYNOPSISxgas [-option ...]
DESCRIPTIONxgas is a physical simulation of an ideal gas in a heated
box. Gas molecules move around the box with velocities
dependent on their temperature. A chamber consisting of
two boxes contains the gas molecules; the temperature of
each box can be independently controlled by a scrollbar.
When gas molecules collide with the walls, their tempera-
ture approaches that of the box.
Use mouse button 1 to create molecules one at a time at
the cursor position. Use mouse button 2 to create the
maximum number of molecules at the cursor position.
OPTIONS
This is a toolkit program;
all the usual toolkit options are available.
-as Sets the autoStart resource.
-ts Sets the timeStepSize resource.
-d Sets the delay resource.
-rb Sets the randomBounce resource.
-eq Sets the equilibrium resource.
-mm Sets the maxMolecules resource.
-fg Sets the foreground.
-bg Sets the background.
RESOURCES
The xgas program uses the following X resources:
autoStart
Starts the simulation automatically. Good for
canned demos.
timeStepSize
Specifies the simulated time duration in microsec-
onds for each cycle of computation.
delay Specifies the real time interval between timestep
computations.
X Version 11 Release 6 1
XGAS(1)XGAS(1)
randomBounce
In each wall collision, a molecule bounces elasti-
cally (angle of incidence = angle of reflection).
A component of randomness is added to this angle.
RandomBounce varies from 0.0 (no randomness) to
1.0 (completely random angle of incidence).
equilibrium
During each wall collision, a molecule's kinetic
energy approaches that corresponding to the tem-
perature of the wall. If equilibrium is 1.0, the
molecule reaches the wall temperature immediately.
For values between 1.0 and 0.0, the molecule
approaches the temperature of the wall more
slowly.
maxMolecules
Specifies the maximum number of molecules in the
simulation.
SEE ALSOX(1), xwd(1)BUGS
When the chamber is resized, molecules should be rear-
ranged appropriately. Instead, the molecule arrays are
reinitialized.
AUTHOR
Larry Medwin
X Version 11 Release 6 2
