How to convert N to kg or kg to N ? And add unit ksc(kg/cm^2) ?

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@SA_10621772 wrote:

And how to make the MathCAT know that 1 kilogram is equal to 9.81 Newton?

 

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You were already told that this is nonsense! 1 kilogram IS NOT 9.81 Newton!! MASS IS NOT FORCE!

You are confusing kilogram (dimension: mass) with kilogram-force (dimension: force) which also was called Kilopond.

https://en.wikipedia.org/wiki/Kilogram-force

"kgf" is a unit for force which is also pre-defined in Prime

According the unit "ksc" - its defined as Kilogram-force per square centimeter.

https://en.wikipedia.org/wiki/Kilogram-force_per_square_centimetre

This unit is NOT predefined in Prime, but if you need a pressure unit which is not predefined

you always can define your own units. I would suggest doing so at the top of the sheet in a collapsed area and not using the global assignment.

When you define a new unit, you should also label it as "unit" for consistency.