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Either "kph" or "kmph" is a casual, sloppy, but common way, along with abbreviations like "gms" (grams) or "mts" (metres). None of these are unusual in the UK.

The correct way is km/h, or (occasionally, for mathematicians or scientists) km·h⁻¹ or km h⁻¹.



I have never seen 'mts' used before, why would you, when 'm' is both more concise, and more correct?

I may have seen 'gms', but I can't think when.

I have seen kmph before, but not for several years.

'Kph' it's definitely current in spoken language, but increasingly rare in written form.


> I have never seen 'mts' used before, why would you, when 'm' is both more concise, and more correct?

I don't know, but it's particularly common with construction materials. You can search "mts" and see many sites using the abbreviation.


I don't get it. 'm' is already as short as it gets. Why invent your own short-hand?




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