The result of your conversion between Btu and nanogram/liter appears here
To convert between Btu and Nanogram/liter you have to do the following:
First divide 1055.0559 / 1.0E-12/0.001 = 1055055900000.
Then multiply the amount of Btu you want to convert to Nanogram/liter, use the chart below to guide you.
Symbol: Btu
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Symbol: ng/l
No description