A nanometer (nm) is a unit of length in the metric system, defined as one billionth (10-9) of a meter (m). The meter is the base unit of length in the International System of Units (SI), making the ...

Weather-watching expert David Phillips remembers the confusion that came when Canada switched over from the imperial to the metric system 50 years ago.

It was the first in a series of events designed to promote understanding and acceptance of the metric system. "We were the guinea pig," said David Phillips with Environment and Climate Change Canada.