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Re: when to write radians



Could someone define "dimensionless"?

I had thought that "dimensionless" meant having no dimension and thus
all ratios of similar dimensions were "dimensionless" (though not
unitless). But now I realize I have been using the term differently
than others. Is a mixing ratio of 2 g/kg dimensionless? Is a
conversion ratio like 3.2 ft/m dimensionless?

____________________________________________________
Robert Cohen; 570-422-3428; www.esu.edu/~bbq
East Stroudsburg University; E. Stroudsburg, PA 18301