In the layer properties window, there are settings for thickness and weight. However, it’s not labeled in the unit of measurement (metric tons, mm/cm/in/ft).
What units are they measured in and do they changed based on project settings for imperial vs metric?
With my old version of FS, I’m asked what unit system (metric or imperial) I’m going to use when I create a new file. Is this feature disabled with the latest versions? 😉
Anyway, you can check the used unit by drawing a square (each side = 1 unit, whatever unit it is), giving it a thickness of 1 unit, and giving it a density of 1 (like if it was water). Then check for the weight.
1 cube meter of water weights 1000 kg.
1 cube foot of water must weight around 60 lbs.