xgas - animated simulation of an ideal gas
xgas [-option...]
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.
xgas 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 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.
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 collision,
a molecule bounces elastically (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). During
each wall collision, a molecule's kinetic energy
approaches that corresponding to the temperature 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. Specifies the maximum number of molecules in the
simulation.
When the chamber is resized, molecules should be rearranged
appropriately. Instead, the molecule arrays are
reinitialized.
X(1X), xwd(1X)
Larry Medwin
xgas(1X)
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