The result of your conversion between pound/cubic foot and tonne/cubic meter appears here
To convert between Pound/cubic Foot and Tonne/cubic Meter you have to do the following:
First divide 0.45359237/((0.0037854118/231)*1728) / 1000/1 = 0.01601846
Then multiply the amount of Pound/cubic Foot you want to convert to Tonne/cubic Meter, use the chart below to guide you.
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