Capacity is the same as the volume of the inside of a container. Often, in mathematical exercises, the internal and external volumes are assumed to be the same (ie thickness of the container is zero). In this case, the capacity is the same as the internal or external volume.
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V=Bh
use the formula 4/3*π*radius3 to find the volume of a sphere.
Mass = Density x Volume
Use the formula for volume to solve for the radius of the sphere and then plug that radius into the formula for the surface area of a sphere.
Write down the formula which isV=4/3¶r3 and plug the volume in for V and solve it like you would any other equation. Once you've found r which is the radius, multiply that by 2 to get the diameter.