Conversation so far:
when did it change from imperial to metric
The traditional system of weights and measures used officially in Great Britain from 1824 until the adoption of the metric system beginning in 1965.
is the imperial system still in use
In addition to the United States, Myanmar and Liberia are the only countries worldwide that use the Imperial Standard.
what about the metric conversion act
The Metric Conversion Act declared the metric system the preferred system of weights and measures for United States trade and commerce, but permitted the use of United States customary units.
who signed the metric conversion act
The Metric Conversion Act is an Act of Congress that U.S. President Gerald Ford signed into law on December 23, 1975.

Question: what was the emphasis of the conversion
Self-contained rewrite: what was the emphasis of the conversion act