While kph is uncommon and ought not to have come about, the first sentence here [0] acknowledges it, so I don't think it's fair to say that people who use it don't mean what they say.
Thank you, I didn’t realise kph is actually only used in English.
In Europe, kph is non existent, and I felt that it’s bizarre to convert like that.
7.2 km h^-1 if you want to be fully SI correct
> 7.2 km h^-1 if you want to be fully SI correct
You mean 2 m/s.
No, 2 m s⁻¹.
Why don't the ISO like writing km/h?
Because if there are multiple inverted units, you'd need to add parentheses to put them all in the denominator. Tidily giving each a ^-1 is clearer (especially with superscript exponents).
You can use superscript Unicode characters on HN: km·h⁻¹.
Ah but you see, I am on my phone and very lazy.
What's wrong with a/b/c
I guess they stick rigidly to things that are formally defined, in case somebody thinks that division is right-associative and it leads to the Challenger shuttle exploding again.