Archimedes' principle is used. Water will be displaced by the volume of what is put into it. That displaced volume can be measured giving the weight.
Displacement (of a liquid).
You will need the mass and volume of the block. To find mass, use an electronic balance. To find volume, use length x breadth x height. For irregular solid, use the water displacement method. The density is mass divided by volume.
by applying archemedes priciples, volume of the water displaced is equal to the voulume of the irregular object , measured by using a mesuring jar
First find the mass of the object. You need to find the volume of the irregular object. You do this by water displacement. If the object can fit into a graduated cylinder, you fill the cylinder with enough water to completely cover the object. DO NOT put the object in yet. Record that volume. Then gently place the object into the cylinder and record the new volume of water. The difference between the first and second volume is the volume of the object in mL, which is the same as cm3. If the object is too big to fit in a graduated cylinder, you can use an overflow can. You fill the can completely with water. The can has a downspout that will allow the water to flow out of the can. To do this, fill an overflow can completely with water. Allow the excess water to drain out of the downspout. Then place a beaker under the downspout. Gently put the object into the overflow can and catch the water that flows out in the beaker. Pour the water into a graduated cylinder and read the volume. This is the volume of the irregular solid. You can also hold a graduated cylinder under the downspout and let the water flow into the cylinder directly. The volume in the cylinder is the volume of the irregular object. Once you have the volume of the irregular solid, you can use the density formula to find density. Density = mass/volume. See the related links below.
To measure volume of large irregular shaped objects you need a displacement can
The volume of an irregularly shaped solid such as a watch is found by immersing that solid in water inside a graduated cylinder. You can then simply read the change in water level off the markings on the cylinder. Of course, if your watch is not water proof, this may not be such a good idea.
The water displacement method is typically used to find the volume of an irregular solid. The object is submerged in a known amount of water, and the increase in water volume is measured. This increase in volume is equal to the volume of the irregular solid.
Liquid displacement
To find the volume of an irregular solid, use the water displacement method. Immerse the item fully into a filled container of water and measure the liquid that overflows. *If the material is porous or soluble, some improvisation will be necessary, such as a thin plastic coating.
The method used to measure an irregular solid by placing it in water is called dispersion. If you note the level of the water before placing the object in and the level after, you can find the volume of the object by calculating the difference.
Fill the can to the overflow level with water.Very gently lower the irregular solid into the can and make sure to catch all the overflow.Measure the volume of overflow.That is the same as the volume of the irregular solid.Warning! This method will be a total disaster if the solid is soluble in water. You could try any other liquid instead.
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When you need to find volume of an irregular solid or a liquid.
Displacement method.... Is the method to find volume of an irregular object
There are many ways to find the volume of irregular shapes, but the most commonly used method is Water Displacement.
A graduated cylinder.
He discovered the method to calculate the volume of a irregular object (rock).
If the solid is a regular shape, such as a cylinder or sphere, you can find the appropriate dimensions and use formulas to find the result. If it is of a irregular size, I doubt if there is another method (even if there is, displacement of water would most likely be the simplest method)