[Gmsh] Controlling Mesh Size in GUI

[Rudin, Andrew]

I'm new to Gmsh and I'm trying to learn the basics from the GUI
interface.  I'm trying to play with building a 2-D mesh on a simple box
and then inspect the output as I change mesh parameters.  I'm trying to
manipulate the average size of each triangle in the mesh, but the output
is not changing.  Here's some of the things I've tried.
 
-Open 2.5 GUI 
-Add 4 points at [0,0], [100,0], [100,100], and [0, 100]
-Draw lines between the points to create a square
-Create planar surface from lines.
-Create 2D mesh by going to Mesh->2D
    -a basic mesh is created, average triange area appears to be about 1
square units of a 10,000 square unit box
 
Here's the problem.  Now I want to control the size and dicate every
triangles area should be about 100 square units.
 
-Set mesh 'element size factor' to 100 by going to
Tools->Options->Mesh->Change element size factor to 100, then on the
main Gmsh GUI go to Mesh->2D to rebuild
 
After this the mesh does not seem to resize to have bigger triangles
 
Thanks for any help you can provide.
 
Andrew Rudin
 
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