Plummeting insect numbers threaten collapse of nature

[burkhard]

(05-11-2019 12:17 PM)ijabbott Wrote:  

(05-10-2019 09:41 PM)Thomas Okken Wrote:  Sure. Draw two straight line segments that meet at one point, and draw them such that the angle between them is one radian. That's a physical angle of one radian right there.

But an angular displacement is just a purely numerical operation, basically a type of multiplication, so why does it need units appended to it? Similar affine transformations such as scaling do not need units.

Yeah, you are right. I think radians in fact are considered derived SI... in fundamental units of m/m, which cancelling out is as you say... :-)