Question: what is nm in physics?
Answer: Nanometer (nm), an SI unit of length, equal to 10−9 m (a thousand-millionth of a meter) Nanomolar (nM), in chemistry, one thousand-millionth molar. Nautical mile (NM or nmi), a unit of length used for maritime and aviation purposes. Newton metre (Nm, may also be written as N·m), a unit of torque.