Immerse the object completely in a liquid (e.g. water) and measure the volume of liquid displaced.
Integration. The volume is divided into small pieces; the volume of each piece is added.
Mass divided by Volume = Density. Or use the displacement method for an irregularly shaped object.
the water displacement method
Finding the center of gravity of an irregularly shaped object can be done using the plumb line method.
It depends on what the second method is!
Use volume displacement method.
It is the displacement method.
Google "Archimedes' Principle" and see if that gives you a clue...
Half fill a graduated glass beaker with water and note the level. Place irregularly shaped object into the beaker. Note the new level. The difference between the two levels is the volume of the object. cw: OK, that method works for objects that don't get wet -- like steel. Tissue paper would not be a good candidate. Also, if the object floats, you have to submerge the object.
Asteroid
method usede to figure the volume of an irregular shaped object
If the object in question is water proof, and small enough. You can measure the amount of displaced water when it is placed in a tank full of water, this may not work for a lot of things but it can help when attempting to measure some objects.
Tight