xgas(1X)xgas(1X)NAMExgas - animated simulation of an ideal gas
SYNOPSISxgas [-option...]
OPTIONS
This is a toolkit program; all the usual toolkit options are available.
Sets the autoStart resource. Sets the timeStepSize resource. Sets the
delay resource. Sets the randomBounce resource. Sets the equilibrium
resource. Sets the maxMolecules resource. Sets the foreground. Sets
the background.
DESCRIPTIONxgas is a physical simulation of an ideal gas in a heated box. Gas mol‐
ecules move around the box with velocities dependent on their tempera‐
ture. 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 temperature 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.
RESOURCES
The xgas program uses the following X resources: Starts the simulation
automatically. Good for canned demos. Specifies the simulated time
duration in microseconds for each cycle of computation. Specifies the
real time interval between timestep computations. In each wall colli‐
sion, a molecule bounces elastically (angle of incidence = angle of
reflection). A component of randomness is added to this angle. Random‐
Bounce varies from 0.0 (no randomness) to 1.0 (completely random angle
of incidence). During each wall collision, a molecule's kinetic energy
approaches that corresponding to the temperature of the wall. If equi‐
librium 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. Specifies the maximum number of molecules in
the simulation.
BUGS
When the chamber is resized, molecules should be rearranged appropri‐
ately. Instead, the molecule arrays are reinitialized.
SEE ALSOX(1X), xwd(1X)AUTHOR
Larry Medwin
xgas(1X)
