The easiest way is to place the object in a graduated beaker of water, and see how much the water rises when you put it in.
Archimedes Principle says that the volume of the object is the same as the water displaced from the beaker.
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The volume of an irregularly shaped solid can be measured by placing the solid in a known quantity of water in a container with measurement markings. Take the new volume and find the difference between this and the old volume. This is the volume of your irregularly shaped solid.
Use volume displacement method.
When you are trying to find the volume of an irregularly shaped object.
break it up into pieces you know how to find the volume of
Take an amount of water of which you know the volume. Drop the object in the water. Find the difference
Get a sample of the metal. Use a scale to find its mass. If it is shape is that of a rectangular solid (box) measure length, width, and height and multiply to find volume. If it is irregularly shaped, use the water displacement method to find its volume. Divide the mass by the volume to get the density.
It is used to find the volume of an irregularly shaped object. An object dropped into a volume of water will displace an equal volume of water.
It is the displacement method.
To find the volume of a rectangular prism, multiply the base, width, and height. If the prism is irregularly shaped, multiply the base and the height.
Weight it. Find it's volume. (hint - how much water does it displace). Divide.
Once easy way is displacement. You can place it in liquid and see how much liquid it displaces. This will be the volume.
A good strategy if you can't use calculus is to break them into components that are shapes you can find the volume for. For example, a dumbbell is basically three cylinders - two on the ends and one central bar. You can find the volume of each and add them together to find the total volume.