Which of these base units is currently not defined by constants of nature?
A) time
B) length
C) mass
D) current

Name: Which of these base units is currently not defined by constants of nature? A) time B) length C) mass D) current
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Question

Quizplus · Accepted Answer

The unit of mass, the kilogram, is defined by a physical object, the International Prototype of the Kilogram, rather than a constant of nature. However, efforts have been made to redefine it using the Planck constant.

Which of These Base Units Is Currently Not Defined by Constants