which is the si base unit for mass?#n##n##n##n##n##n#meter#n##n##n##n#pound#n##n##n##n#gram#n##n##n##n#foot
U.S. National Prototype Kilogram. The kilogram is the SI base unit of mass and is equal to the mass of the international prototype of the kilogram (link is external), a platinum-iridium standard that is kept at the International Bureau of Weights and Measures (BIPM) (link is external).