The volume of the object is 7ml.
Volume displacement.
It is the displacement method.
When you are trying to find the volume of an irregularly shaped object.
Volume displacement is the method used to find the volume of small or irregularly shaped objects by noting the difference in the level of liquid before and after after immersing an object into a graduated cylinder or beaker of liquid. For a small object immersed in a graduated cylinder or beaker, the volume displaced by the object can be read directly from the scale on the container.
By water displacement. Pour a certain volume of water into a graduated cylinder, and record that volume. Now, place the irregularly shaped object into the cylinder, and record the level to which the water now rises. Take the difference between those two volumes, and you now have the volume of your irregularly shaped object.
Finding the center of gravity of an irregularly shaped object can be done using the plumb line method.
the water displacement method
Volume displacement is the method used to find the volume of small or irregularly shaped objects by noting the difference in the level of liquid before and after after immersing an object into a graduated cylinder or beaker of liquid. The difference between the before and after levels of the liquid is the volume of an immersed object.
Mass divided by Volume = Density. Or use the displacement method for an irregularly shaped object.
displacement - invented by Archimedes. Completely fill a large volume of something with water. Have a spout to channel all excess water. Place a graduated cylinder under the spout. Place irregular object in the large volume filled with water. The volume of the irregular object will displace an equivalent volume of water into the graduated cylinder. The measured volume in the cylinder is the volume of the irregular object.
Use volume displacement method.
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.