Unit Definition (once [France]) The onça, once, oncia, onza is traditional names for the ounce unit in Romance languages. The French once equals 1/16 livre or about 30.59 grams (1.079 ounce).
Unit Definition (nanogram) The nanogram is a metric unit of mass equal to 10E-9 gram, or one millionth of a milligram.
Weight/Mass 
