A tank 4m long , 3m wide and 2m deep filled to the brim with paraffin ( Density =kg/m^3).What is the thrust ( force ) on the base ?

Answer 1

pressure = ( Patmosphere + density * g * 2 meters) * 12 m^2 base area

of course the atmosphere may also push up from below so may not enter your problem if it is net force you want.