What is the formula used to calculate the weight of an object?

The answer two this question depends on two factors:

- Determining the volume of the shape in question.

- Determining the weight the of the matter the object is composed of.

For example a 3 dimensional square that is 1 meter in length, 1 meter in width and 1 meter in height is filled with water. To determine the weight of the water:

- The volume formula for a rectangle is volume = length X width x height; In our case volume = 1 x 1 x 1 = 1 m^3 (one meter cubed)

- the wight of water is 1 per cubic meter.

Therefore 1 m^3 of water weighs 1 kg.