Tight
Finding the center of gravity of an irregularly shaped object can be done using the plumb line method.
the water displacement method
Mass divided by Volume = Density. Or use the displacement method for an irregularly shaped object.
Asteroid
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.
Use volume displacement method.
Take an amount of water of which you know the volume. Drop the object in the water. Find the difference
It is used to find the volume of an irregularly shaped object. An object dropped into a volume of water will displace an equal volume of water.
Using a graduated beaker, add water sufficent to totally immerse the object. Note the initial volume of the water without the object. Put the irregularly-shaped object in the beaker and note the final volume. The difference between the final and initial readings is the volume of the object. This is only possible if the object is not soluble in water. If it is, use some other fluid in which it is not soluble.
When you are trying to find the volume of an irregularly shaped object.
Volume displacement.
It is the displacement method.