== Major cleanup of unique theory == 

 @DHeyward - I've let your unique - no force pushes or pulls the liquid up - theory, persist in this article for far too long. I'm going to restore it mostly back to the consensus that it had for years up until about March 2014. I'm willing to discuss it before restoring it, but it has to be a good faith discussion where we can hope to make some progress, which means I need you to answer reasonable questions, unlike before when you usually ignored my questions. I'm not talking about too elaborate of questions, just things like do you agree or disagree on certain points, so I can figure out what you're thinking and figure out what I need to say to get the principles across. Are you willing to answer reasonable questions and have a discussion? If not I'm going to start the major restoration. A good first question we were unclear on before is: do you agree that pressure is basically defined as force per unit area?