Weight Error

Hi all,

I have been trying to calculate a CG point of a complete piping assembly. But when i go mass properties and give preview the weight i got for given density is lot more (its in tonnes) for computed data. Even though the assigned density is 7.8e-6 the dialogue box showing 2.4622219e-02 kg/mm3 and weight is in tonnes (please see the attached image). Have any one came across this issue??? I have seen this type of error in Weight when i am dealing with Hose and Pipe routing (in Piping Tool). Please let me know how can i get accurate weight.

Thank you in advance...!

P.S. when assigned i get correct weight.