This is the first expansion of the measurement system since 1991, according to the National Physical Laboratory. "R" and "Q" represent ronna and quetta while "r" and "q" represent ronto and quecto.

In the 1790s, piracy of a ship carrying metric standards intended for then-U.S. Secretary of State Thomas Jefferson played a role in America's decision to not adopt the metric system.

A rainbow-colored path marked with metric units helps students gauge the length of things using the metric system. (Courtesy photo) “We want our students to be bilingual in measurement,” she said.

While these three countries continue to use the imperial system, both Liberia and Myanmar are gradually introducing metric units, which are already widely used in some contexts. In the United ...

A description of the measures used for weight, length and volume in the past, such as cubits, spans, feet, grains of barley, stones and pints. The metric system was introduced to standardise ...

A park ranger takes a photo of a thermometer at California’s Death Valley National Park in 2021. Metric was officially declared America’s preferred system of measurement in 1975, but the U.S ...

The pre-metric system in France was particularly complicated and by 1789 there were at least 800 different units of measurement, many of which varied according to which town you were in or the ...