# Does the language on error message convey correct?

We are developing carpool app. Does the language reflect politeness and accuracy in intension?

• Km (kilometer) is a unit, not a quantity. Therefor you cannot use sentences like "buy kilometers", or "exchanging km". May 14, 2014 at 7:46
• km in our context is quantity. People exchange km as they drive each other. We can redeem km for cash. Please suggest. May 14, 2014 at 7:49
• How can km be a quantity? 1 km = 100000 cm. Now consider the following sentences: "I have a very large amount of centimeters", "Please give me you centimeters", "I would like to exchange my centimeters for cash". That does not make sense. The quantity you are looking for is travel distance! May 14, 2014 at 12:26
• Also, please don't ever use "Ok". It is not OK to use "Ok". In the worst case I am OK with "Okay", but never "Ok". May 14, 2014 at 12:29
• The difference is that "reputation" nor "money" are units. Units are: km, kilogram, km/h, psi, Liter,... Reputation and money can be considered as a quantity. Kilometer cannot. May 15, 2014 at 6:27