The volume is the amount of three-dimensional space that something takes up- the volume of your container will always be 1 , regardless of what's inside it. The mass will change, depending on the density of the material.
Is the volume of a container dependent on the mass and density of the liquid in it, according to the equation m = d x v (mass = density x volume)? If so, then a 1 cu.m container that is filled with water will hold 1000 L of water (density of water = 1 g/cm3). However, if the container is filled with petrol (density of petrol = 750 g/L), then a 1 cu.m container filled with petrol will hold 750 L of petrol? Is this correct?