How to convert kg / m3 into g / mm3 to know

How to convert kg / m3 into g / mm3 to know

kg/m3=g/mm3* 1/1000000

Specific conversion process of kg / m3 g / cm3
Why is 1g / cm3 = 1000kg / m3?

1kg=1000g
1m3=1000dm3=1000*1000cm3
∴1kg/m3=1000g/(1000*1000)cm3=(1/1000)g/cm3
I'm sorry I didn't type anything. There's no problem with simplification

1kn = how much T = how much kg? Who knows, the specific conversion ah?

K --- thousand kilos
N -- the unit of Newtonian force
8 N / kg
The usual unit of force is kilogram force (kilogram force) ton force
1kg force = 9.8N
1 ton force = 1000 kg force = 9.8kn