Why is model space scale for dimensions defaulted to 10.0?

couldnt understand why creating a 1mm high dimension saw it 10mm high.
Then eventually noticed the default model space scale was 10.0 when looking at the selected dimension properties panel.

Property overide in V5, I see property , is that same or is that going to alter property of all dims using that dim style ?

overide was a comforting word to see.


The model space scale is a property of the annotation style so if you change it in your template file, you can have any value you want.

Any property that you change in the object properties pages makes an override for the selected objects only.

Any properties that you change in the annotation style dialog in document properties will affect any annotations that use the style unless the specific value has been changed in properties.