HORTICULTURE

Detailed explanation-1: -The prefix “nano” means “one billionth”, or 10-9, in the international system for units of weights and measures. The abbreviation for nanometer is “nm."

Detailed explanation-2: -The nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the International System of Units (SI), equal to one billionth (short scale) of a metre (0.000000001 m) and to 1000 picometres.

Detailed explanation-3: -The newton-metre (also newton metre or newton meter; symbol N⋅m or N m) is the unit of torque (also called moment) in the International System of Units (SI). One newton-metre is equal to the torque resulting from a force of one newton applied perpendicularly to the end of a moment arm that is one metre long.

Detailed explanation-4: -Nanometer (nm), an SI unit of length, equal to 10−9 m (a thousand-millionth of a meter)

Detailed explanation-5: -A nanometer is a unit of length in the metric system and is equal to one billionth of a metre (0.000000001 m) . It is abbreviated as nm and it is a unit for small lengths.