g is the surface tension. changing it will scale the entire image
p1 is the pressure in the left bubble. you can change it with the slider bar
p2 is the pressure in the right bubble. it also has a slider bar.
pair is the outside air pressure. also has a slider bar
the point A can be moved around to change the location of the interface
if there is no solutions to the equations (e.g. p2 is very high so the radius of curvature is small and the bubble to too small to reach to point A) then it will disappear until the slider bar moves back into the range where there is a solution