The current definition of the standard kilogram of mass is based on
A) the mass of the earth.
B) the mass of the sun.
C) the mass a particular object kept in France.
D) the mass of a cesium-133 atom.

Question

Quizplus · Accepted Answer

The current definition of the standard kilogram of mass is based on the mass of a particular object, known as the International Prototype of the Kilogram, which is kept at the International Bureau of Weights and Measures in France. This object has been used as the standard for the kilogram since 1889.

The Current Definition of the Standard Kilogram of Mass Is