CBSE Class 11-science Answered

In each casatomic standards of length and time , the change in definition achieved not only an increase in accuracy, but also progress toward the goal of using fundamental physical quantities as standards, in particular, the quantum mechanical characteristics of atomic systems.

 General Conference on Weights Measures is responsible for the maintenance of an international system of units in harmony with the advances in science and industry. This organization uses the latest technical developments to improve the standards system through the choice of the definition, the method to experimentally realize the definition, and the means to transfer the standard to practical measurements.