But if I look at the page for "friction" it has tables of actual values and many references to practical experiments? NB I was just comparing the writing style

But if I look at the page for "friction" it has tables of actual values and many references to practical experiments? NB I was just comparing the writing style of that page (which seemed a bit odd to me) with other examples. https://en.wikipedia.org/wiki/Friction https://en.wikipedia.org/wiki/Friction