What does normalizing a straight line mean?

Sayed · Mar 12, 2018

Good day,
From the first attachment...

Why is "D" divided by "D1"? The book is saying that it is for normalizing "D" by the value of "D1".
It's not quite clear !

The whole formula is to find the slope of this graph.

Chestermiller · Mar 12, 2018

Who knows what the author was thinking. Maybe it is in the context of the remainder of what he has written

mfb · Mar 12, 2018

It is simply some scaling applied, e.g. to compare the observed drag (and its change) to some previously considered value D₁.

What does normalizing a straight line mean?

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What does normalizing a straight line mean?

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