It means cubic.
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There is no conversion. "Cu ft" is a volume measurement, "kg" is a mass measurement.
If it has a 90 degree angle in its cross-section then its volume is 0.5*4*9*15 = 270 cubic units
This compares a linear measurement to a volumetric measurement. A foot is 12 inches and a cubic foot is 12 inches long x 12 inches wide x 12 inches high.
As a litre is a measure of volume, I'll assume you mean what is 500 litres in cubic inches: 1 litre = 1000 cu cm 1 in = 2.54 cm (exactly) 1 cu in = 1 in x 1 in x 1 in = 2.54 cm x 2.54 cm x 2.54 cm = 16.387064 cu cm → 500 litre = 500 x 1000 cu cm = 500000 ÷ 16.387064 cu in ≈ 30511.87 cu in (≈ 17.657 cu ft)
I quess it should be what is a smoot not what does it mean. It is a unit of measurement.