sentences: a kilogram is a kind of unit for measuring mass
docs: kilogram is measure_of_weight. weight_unit is unit_of_measurement. kiloliter is metric_capacity_unit. mass_unit is unit_of_measurement. metric_weight_unit is mass_unit. atomic_mass_unit is mass_unit. kilogram is metric_weight_unit. unit_of_mass is unit_of_measure. kilogram is metric_unit_of_measurement. kilogram_meter is work_unit.