What is mass?Mass is a measure of the amount of matter in an object. Mass should not be confused with weight. Weight is the measure of the intensity of the force imposed on this object by gravitational field.
InputPound is a unit of mass used in the imperial, United States customary and other systems of measurement. Since 1 July 1959, it has been defined as exactly 0.45359237 kg.
Ounce is the name of several different units of mass, weight, or volume used in most British derived customary systems of measurement. As a unit of mass, it is defined as one sixteenth of a pound (lb).