Two drums of the same size and height are taken. i) what will be the difference in liquid pressure on their bases if A of them is completely filled and B is filled half and kept at the same place. ii) what will be the difference in liquid pressure on their bases if both A and B are filled with water completely but on of them is kept in india and another in nepal?why? iii) what will be the difference in liqid pressure on their bases if A is filled with water and B is filled with salty water and kept at delhi at the same position?why?