Meet the metric system’s newest prefixes: ronna-, quetta-, ronto- and quecto-. Science News spoke with Richard Brown, head of metrology at the National Physical Laboratory in Teddington, England ...

New unit measurement prefixes are added to the metric system The mass of the Earth can now be measured as 6 ronnagrams rather than 6,000 yottagrams. An electron's mass can now be said to be about ...

Four new prefixes extend the way we can uniformly quantify—and name—the extreme ranges of numbers.

Scientists have approved the introduction of four new prefixes that can be applied to units of measurement in the metric system.

As science has expanded to the huge and the tiny, the need for new metric-system prefixes has grown accordingly. These have made their way into common parlance mostly through computing.

In the world of science, SI prefixes are sacrosanct. Well, unless you happen to be a computing scientist, in which case the choice of prefix—mega vs mebi—can be a little controversial. It ...