GEEZ...

In the first post on that other thread.. I used

"One cylinder of a 300 , when 100 psi is put on top of it is 1200 pounds of force... THE ENGINE WILL TURN IF NOT PERFECTLY CENTERED AT TDC...."

In a later post in that same thread I said
"thus at 100 pounds per square inch makes 1200 pounds of pressure on top of the piston." (which I still say is true)

And this latter is what you are (trying) to bust my chops on ?
This is what Dictionary.com uses for these two words...

Force:
A vector quantity that tends to produce an acceleration of a body in the direction of its application.

pressure:
Force applied uniformly over a surface, measured as force per unit of area.

Just consider my "unit of area" as Piston Top.... and I know you knew that with the piston in a bore and connected to the crank that it was going to be a directed (vectored) application of power...