Length X Width X Height (L X W X H)
Finding the center of gravity of an irregularly shaped object can be done using the plumb line method.
When you are trying to find the volume of an irregularly shaped object.
The volume of the object is 7ml.
the water displacement method
Mass divided by Volume = Density. Or use the displacement method for an irregularly shaped object.
Asteroid
batholiths
break it up into pieces you know how to find the volume of
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
Use volume displacement method.
Take an amount of water of which you know the volume. Drop the object in the water. Find the difference