a kilogram is a kind of unit for measuring mass
kilogram is metric_unit_of_measurement. unit_of_mass is unit_of_measure. kilogram is measure_of_weight. kilogram_meter is work_unit. kilogram is not metric_weight_unit. kilogram is not measure_of_weight. atomic_mass_unit is mass_unit. kilogram is metric_weight_unit. mass_unit is unit_of_measurement. kilogram is not metric_unit_of_measurement.