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DISCLAIMER: I'm new to this (specific) site, and I couldn't find any other Stack site that matches with my question.

I'm working on a mobile project and am hanging cardboard "medallions" on it. I am calculating the torque created by each side to balance them out.

However, the medallions are really light, so I can't just weigh them: instead, I plan to find the volume (area calculated using free online tool Sketch and Calc, height measured with ruler) then multiply it by cardboard's density.

But that's where I run into problems: I don't know the density of cardboard. I was wondering if someone could help me out.

I'm referring to the corrugated cardboard with two flat linerboards, with a flute in between them. Specifically, the type of cardboard Amazon uses with its boxes (the type of cardboard I'm using).

I would like the density in kg/(cm^3) (the medallions, along with being light, are also small).

After searching on the internet, I found (corroborated by two sources) that the density of cardboard is from 0.6-0.7 kg/m^3. Does this make sense?

DUO Labs
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Calculating the density of the cardboard seems like extreme overkill here.

Just take a representative piece of your cardboard to the local postal service retailer (like a FedEx or UPS store) or even to a government post office and ask them to weigh it with their sensitive scale. If they ask why just tell them you may need to know for future shipping purposes.

Jimmy Fix-it
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