Here, I'm using the equation for the volume of a sphere, which is where the 4/3 comes from. Don't worry, we can put some numbers in later. Now for the weight of this sphere.

The volume of a sphere can be found using the formula Volume of a Sphere = 4/3 πr 3 Calculate the volume of a grain of sand. Record your calculation. 4.

To calculate the volume we multiply these values together. The answer will be written in [units]³. It is more accurate to use π = 3.142 or the π button on a calculator.