g.mm units problem

[Dan888]

Hi - see attached.

I'd like to show OOB with units of gram-millimeters (g.mm).

When I change the units from m.kg to g.mm it adds kg.s^2/m.

Can this be avoided?

[AndyWesterman · Accepted solution]

Instead of g*mm try gm*mm

regards

Andy

[MikeArmstrong]

Gram is defined in Mathcad as gm not g. G is the gravitational constant.

[Dan888]

Thanks

As gm is not an SI unit, I have redefined g as gm using the global definition.

[MikeArmstrong]

I would recommend against doing that.

[Fred_Kohlhepp]

Mathcad recognises "g" as the value of gravity at the earth's surface (9.8 m/sec^2), which is why the you got "kg8s^2/m added to your answer at the start.

You can redefine g to be grams (g = gm) but it's better (IMHO) just to use the "gm" built in.