[MHGinTN]

Um, you could measure the radius and the diameter of a circle, but it is the ratio of those two values which nets 'pi' and you cannot write the last digit of pi, unless you've discovered something i'mnot aware of.

Now, using pi in the equation for finding volume of a sperical object, how do you reconcile the fact that as a real gravitation field gets larger, the ratio no longer meets the real volume to surface ratio as calculated with a pi as constant?

[MHGinTN]

BTW, this entire argument for a variable pi based upon changing gravitational field is straight out of the Feynman lectures at CalTech.

[r9etb]

Um, you could measure the radius and the diameter of a circle, but it is the ratio of those two values which nets 'pi' and you cannot write the last digit of pi, unless you've discovered something i'mnot aware of.

It is nevertheless physically measurable (within the limits of the measuring device), which means that it's not an "abstract" quantity in the normal sense of that word.