Model the bulk external pressure

To exert an external bulk pressure of 10^5 [Pa] on a 10x10 [m^2] square slab (in the x-y plane) consisting of one-layer particles, without making the slab deform, I chose the “fix aveforce” command. But I am not sure if it is right just to specify “fz = 10^7” [N]?

Thanks for any comment to confirm!

Best regard,

The units of pressure and force are different for different choices

of units, as specified by the units command. See its doc

page for details.