Task: Instance Description Understanding (ontology: Sciences/Computer_Science)

Which of the following definitions best describes the instance 'nanometer'?

A. A length unit which is equal to one hundredth of a meter or 10^[-2] m.
B. A length unit which is equal to one thousandth of a meter or 10^[-3] m.
C. A length unit which is equal to one millionth of a meter or 10^[-6] m.
D. A length unit which is equal to one thousandth of one millionth of a meter or 10^[-9] m.

Answer: A length unit which is equal to one thousandth of one millionth of a meter or 10^[-9] m.