Fill the beaker with water, then pour it into a calibrated measuring jug
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To find the volume of an object, we use an overflow cylinder as it gives a measure of the volume of the object by displacing an equal amount of water into the beaker.
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.
Depending on the size of the object this can be difficult. For a large object, lime a mountain, say, you have no option but to estimate. For smaller objects use a large beaker, and fill it with a liquid in which your shape is not soluble. Measure the volume of liquid in the beaker. Then place the object into the water and make sure it is totally submerged. The volume of the water in the beaker will rise and the volume of the shape is the difference between the two measures.
A Beaker.
Fill a market beaker to a specific measured volume. (Eg. 50cm cubed, make sure you have not filled the beaker with water). Now place the object in the beaker with water. The water level should rise (Eg. from 50cm cubed to 60cm cubed). The difference in the original volume and the final volume is the volume of the object. That is the water displacement method.