It depends on what object you are trying to measure.
Displacement is appropriate for a medium sized, non-soluble object, of any shape. It would be pretty useless if you wanted to measure the volume of a concert hall or a needle! And it would not work for a sugar cube either.
A micrometre would be appropriate for small objects with simple geometry, such as a needle or possibly a sugar cube. But is would be no use for a concert hall nor an irregular object.
A ruler would be appropriate for large objects with a simple geometry such as a concert hall. But it would be no use for a needle, nor for an irregular object.
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A beaker is used to measure volume using water displacement.
Volume displacement is a good way to find the volume of a cylinder, and is probably better than simply measuring it. To measure and calculate a cylinder's volume, you must use pi, which is typically rounded to 3.14. Rounding means less accuracy, and there should be no rounding involved in volume displacement.
The volume of an object can be determined by the displacement of water. By dropping the object into a measuring container of water, where the volume of the water is known, the object's volume can then be calculated by subtracting the volume of the water by the volume of the water and object combined.
You fill up water ina beaker, measure the volume of the water as it originally was, then drop in an irregulary-shaped object, measure that volume, and subtrect the two. The difference is the volume of the object.
There are a lot of instruments used to measure water volume. There's also the displacement method to measure liquids.