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4 points
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Never heard anyone use megameters either.

I’ve used it in one specific situation - Physics classes in my freshman Chemistry uni year. The same professor would also use megagrams for weight.

It was mostly so the students got a bit more comfortable converting units back and forth, specially past the 10³~10⁻³ range.

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1 point
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Weird, I’ve never used anything other than unit*10^n on physics. it’s just simpler to operate. 1e3m is 1km, 1e6g a megagram. When working on science, I much prefer the scientific notation.

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2 points

It looks a bit less cluttered, compare e.g. “40.0 Mm” “40.0 x 10⁶ m” or “4.00 x 10⁷ m”. Plus I think that he took into account that he wasn’t lecturing future physicists but future chemists - in Chemistry you rely on those prefixes all the time, and for most stuff you won’t be changing the order of magnitude too much. (Major exception, pK-whatever)

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1 point

Megaparsec, kilojoules, kilo electron volt,… are all very common.

Then on the other hand, giga solar masses is never used.

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