XGAS(1)                                                   XGAS(1)


NAME
       xgas - animated simulation of an ideal gas

SYNOPSIS
       xgas [-option ...]

DESCRIPTION
       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  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.

X DEFAULTS
       The xgas program uses the following X resources:

       timeStepSize
               Specifies the simulated time duration in microsec-
               onds for each cycle of computation.

       delay   Specifies the real time interval between  timestep
               computations.

       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.





X Version 11                Release 5                           1

XGAS(1)                                                   XGAS(1)


SEE ALSO
       X(1), xwd(1)

BUGS
       When the chamber is resized,  molecules  should  be  rear-
       ranged  appropriately.   Instead,  the molecule arrays are
       reinitialized.

COPYRIGHT
       Copyright 1991, Massachusetts Institute of Technology.

AUTHOR
       Larry Medwin












































X Version 11                Release 5                           2