system unit code; (alternative) symbol or; abbrev sample; default conversion SI cubic kilometre km3 km 3 1.0 km 3 (0.24 cu mi) SI cubic hectometre hm3 hm 3 1.0 hm 3 (35,000,000 cu ft) SI cubic decametre dam3 dam 3 1.0 dam 3 (35,000 cu ft)
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