ECONOMICS

Detailed explanation-1: -U.S. customary units have been defined in terms of metric units since the 19th century, and the SI has been the “preferred system of weights and measures for United States trade and commerce” since 1975 according to United States law.

Detailed explanation-2: -Congress has established a national policy to make the metric system the preferred system of measurement for trade and commerce in the United States.

Detailed explanation-3: -Only three nations do not use the metric system today: Myanmar, Liberia and the United States. But calling America a nonmetric nation is somewhat of a misnomer. The United States has given more than an inch even though it might not have gone the whole nine yards.

Detailed explanation-4: -The United States still uses the English system of weights and measures. The metric system is available, but people think quarts and inches, not liters and centimeters. The following charts convert between the English and metric systems for the most commonly used measures.

Detailed explanation-5: -The metric system is the preferred system of scientific units for several reasons: The majority of countries in the world employ the metric system of measurement. The prefixes attached to metric units carry the same meaning for all base units.