Estimates
On many occasions, physicists, other scientists, and engineers need to make estimates for a particular quantity. Note that estimating does not mean guessing a number or a formula at random. Rather, estimation means using prior experience and sound physical reasoning to arrive at a rough idea of a quantity’s value. Because the process of determining a reliable approximation usually involves the identification of correct physical principles and a good guess about the relevant variables, estimating is very useful in developing physical intuition [shorturl.at/eiwH9].
Ref: University Physics by Hugh D. Young, Roger A. Freedman (exercise: 1.17)
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