Because, from Archimedes' Principle, the volume of the water displaced is equal to the volume of the object displacing it. So, were you to collect all the displaced water and put it into a graduated cylinder, it would tell you the volume of the object in question.
Water Displacement Method?
Liquid displacement
water displacement
water displacement
Displacement method.... Is the method to find volume of an irregular object
One way to find the volume of a large irregular shape object is to use the displacement method. Submerge the object in a container of water and measure the volume of water displaced. This volume is equal to the volume of the irregular object.
There are several methods of measuring an irregular shape's volume.Filling it with a known volume of a substance until full.Summing up the Mathematical calculation of sections.
The volume of the object.
One way to measure the volume of an irregular shaped object is by using the water displacement method. Submerge the object in a known volume of water and measure the increase in water level, which is equal to the volume of the object.
Used to measure irregular objects volume.
Displacement
Displacement is used to measure an irregular object's volume. It involves immersing the object in a fluid and measuring the amount of fluid displaced, which is equal to the volume of the object.
Measure the volume of the object which is same as the volume of the displaced liquid in which that sinks. And measure the mass of the same object from a weighing machine. then use density = mass/volume
You need to find the displacement, easiest way for irregular objects is water displacement. If it can fit in a graduated cylinder use that and find out how much water is displaced when the object is submerged. Then weigh it and divide the weight by the volume. Your unit will be whatever units you weighed it in, say grams, per whatever unit you measured displacement in, say cm.
Liquid displacement
Water Displacement Method?
water displacement