Question: problem with tonne units

Dear Community

I have a problem with units definition,I'm working with maple with kgf and tonf,

I read in help page this "A tonforce is defined  as the force of gravity on a short ton.......", so when I convert 1 tonf to kgf I get 907.18kgf,

I know this is OK, but since I don't use short ton in my country I would like to define in METRIC 1tonf = 1000kgf.

How can I do this? Here is a conversion table where it says 1tonf = 1000kgf (metric), not (short)

thanks a lot for your help!



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