4-20mA is used because in that way we can distinguish a ZERO value signal from a malfunction in the measuring circuit (i.e. disconnected cable).
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What advantages did the Romans find in using a cross vault instead of a barrel vault?
Instead of using W as a variable in your model, you use log(W).
a=pi r²a=pi (d/2)²
There is none.
There is no such example. If you cannot use an exact fraction then there will not be an exact decimal that you can use instead. And, if you are using an approximate decimal, you could use an approximate fraction instead.