56. Solving a chemistry problem

1. Two vertical parallel plates are partially immersed in liquid at a distance of 10 mm from each other. The wetting angle of the plates with liquid is 90 degrees. The surface tension of the liquid is 85 mJ/m2, the difference between the densities of the liquid and air is 1 g/ml. Calculate the excess pressure in the liquid and the force of mutual attraction of the plates if their dimensions are 8x8 cm.