There is no equivalence.
An inch is a measure of length or distance in 1-dimensional space while a millilitre (ml) is a measure of volume in 3-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
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Well, I guess it would be 2 87/100 inches.
1 ml = 1 cc 1 inch = 2.54 cm 1 cc = 1/(2.54 inches)3 = 0.06 cubic inches 1 square foot = (12 inches)3 = 1728 cubic inches 1 ml = 0.06 cubic inches / 1728 cubic inches/square foot = 3.5 X 10-5 square feet
A sphere with a radius of 2.12 inches has a volume of 39.91 cubic inches which equates to 654.008mL
3400 ml
5000 mL