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Usually you can use one of the well-known formulae, for example the volume of a sphere, of a pyramid, etc.
If the shape of the object is regular (a cube or a sphere) then the volume can be calculated from the measurement of the object's key dimension(s). And the object's mass can be determined in a mass balance. Give the mass and volume the density is calculated by dividing the mass by the volume. Where the object's shape is irregular, the volume may be determined by measuring the volume of a liquid displaced by submerging the object completely in that liquid.
by measuring the object
If the object in question is water proof, and small enough. You can measure the amount of displaced water when it is placed in a tank full of water, this may not work for a lot of things but it can help when attempting to measure some objects.
To calculate the volume of an irregular object you will need a container with meaurements and water. Place the irregular object in your container and fill with water until the entire object is covered. Record volume A. Then remove the irregular object and record volume B. The volume of your irregulare object is equal to volume A minus volume B.
conclusion
A ruler or other measuring instrument may be used to determine the dimensions of a regularly shaped abject, and the volume may then be calculated by applying the dimensions to the applicable formula.
The length times the width times the height.
Water Displacement Method?
It is length * breadth * height.
Because only regular-shaped objects have a consistent length, width, height, and shape. When dealing with an object composed of differing shapes, your must calculate each portion separately and then add them. For instance, if you have a swimming pool of two depths and want to determine cubic feet, you would have to calculate the volume for each section and then add them.
For mass, you would use a triple-beam balance. For volume, you would either use a graduated cylinder (for liquids), calculate the displacement with a graduated cylinder (for an odd-shaped solid), or calculate it using the equation for volume (for a regularly-shaped solid).
Put solid in a container ; fill container with water to a known container volume; take object out of container and read the remaining volume. subtract this remaining volumefrom the known volume. This result is the volume of the regular or irregular shaped solid.
Usually you can use one of the well-known formulae, for example the volume of a sphere, of a pyramid, etc.
well, for an irregularly shaped object it is a eureka can or a graduated cylinder, but for a regularly shaped object it is a simple formula: Length*Width*Height. I am 10 years old and learned that in science class.
First you get the object mass by weighing it.Then you get its volume by immersing it in a scaled water container and see the increase in water volume which gives the object volume.Then you divide the mass by the volume to get the object density.
length x width x height. So if you had an object that was 10cm long, 10cm wide and 10 heigh the volume would be 1000 cm3