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maybe 20 but im trying to answer this question myself!

It depends on the radius(r) and length(L). Test tubes consist of a cylindrical section and a spherical portion. Assuming the spherical portion is a perfect hemisphere, the cylindrical portion is L-r, and the volume for that is (L-r)(r^2)pi. the hemispherical portion is (2/3)pi(r^3).

So for a 1.6X12.5cm test tube its volume is (12.5-.8)(.8^2)(3.14)+(2/3)(3.14)(.8^3)=25mL.

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