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Parts per billion (ppb) is a unit of concentration, while microliter (μL) is a unit of volume. To convert ppb to microliters, you need to know the density of the substance in question. The formula for this conversion is: microliters = (ppb * volume in liters) / density in g/mL. This formula takes into account the concentration of the substance in ppb and its density to give you the volume in microliters.
Tonnes divided by 1,000 = kg
1 tonne = 1,000,000 grams
To convert from kilograms to tonnes, divide by 1000.
Only if... (a) you know the weight of a measured amount of tarmac - and (b) you know what depth the tarmac is. If you can calculate the volume of tarmac, and you know the weight of a specific amount - you can convert to tonnes.