Given:
Diameter = 7 mm
π=3.14
To determine the sphere's volume, we use the formula:

where:
V=Volume
r=radius
(Note: radius = diameter/2)
Since the diameter is 7mm, the radius is:
radius = diameter/2 = 7/2 = 3.5mm
We plug in r=3.5 mm and π=3.14 into the sphere's volume formula.

Therefore, the answer is 179.5 mm^3.