From a10fa06b01e5ba377210a82637cc57aff96271ee Mon Sep 17 00:00:00 2001
From: sjplimp <sjplimp@f3b2605a-c512-4ea7-a41b-209d697bcdaa>
Date: Fri, 23 Oct 2009 15:26:46 +0000
Subject: [PATCH] git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@3220
 f3b2605a-c512-4ea7-a41b-209d697bcdaa

---
 doc/fix_heat.html | 13 +++++++------
 doc/fix_heat.txt  | 13 +++++++------
 2 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/doc/fix_heat.html b/doc/fix_heat.html
index c0bdd44ca3..a3bb9c0644 100644
--- a/doc/fix_heat.html
+++ b/doc/fix_heat.html
@@ -38,13 +38,14 @@ they may move to.
 </P>
 <P>Heat addition/subtraction is performed every N timesteps.  The <I>eflux</I>
 parameter determines the change in aggregate energy of the entire
-group of atoms.  Thus it is an "extensive" quantity, meaning its
+group of atoms per unit time, e.g. in eV/psec for <A HREF = "units.html">metal
+units</A>.  Thus it is an "extensive" quantity, meaning its
 magnitude should be scaled with the number of atoms in the group.
-Since eflux is in units of energy/time, this means a larger value of N
-will add/subtract a larger amount of energy each timestep the fix is
-invoked.  If heat is subtracted from the system too aggressively so
-that the group's kinetic energy goes to zero, LAMMPS halts with an
-error message.
+Since <I>eflux</I> is independent of N or the <A HREF = "timestep.html">timestep</A>, a
+larger value of N will add/subtract a larger amount of energy each
+time the fix is invoked.  If heat is subtracted from the system too
+aggressively so that the group's kinetic energy would go to zero,
+LAMMPS halts with an error message.
 </P>
 <P>Fix heat is different from a thermostat such as <A HREF = "fix_nvt.html">fix nvt</A>
 or <A HREF = "fix_temp_rescale.html">fix temp/rescale</A> in that energy is
diff --git a/doc/fix_heat.txt b/doc/fix_heat.txt
index db62eab9fe..7fe2108761 100644
--- a/doc/fix_heat.txt
+++ b/doc/fix_heat.txt
@@ -35,13 +35,14 @@ they may move to.
 
 Heat addition/subtraction is performed every N timesteps.  The {eflux}
 parameter determines the change in aggregate energy of the entire
-group of atoms.  Thus it is an "extensive" quantity, meaning its
+group of atoms per unit time, e.g. in eV/psec for "metal
+units"_units.html.  Thus it is an "extensive" quantity, meaning its
 magnitude should be scaled with the number of atoms in the group.
-Since eflux is in units of energy/time, this means a larger value of N
-will add/subtract a larger amount of energy each timestep the fix is
-invoked.  If heat is subtracted from the system too aggressively so
-that the group's kinetic energy goes to zero, LAMMPS halts with an
-error message.
+Since {eflux} is independent of N or the "timestep"_timestep.html, a
+larger value of N will add/subtract a larger amount of energy each
+time the fix is invoked.  If heat is subtracted from the system too
+aggressively so that the group's kinetic energy would go to zero,
+LAMMPS halts with an error message.
 
 Fix heat is different from a thermostat such as "fix nvt"_fix_nvt.html
 or "fix temp/rescale"_fix_temp_rescale.html in that energy is