The Newton (N) is the SI unit for force, and the meter (m) is the SI unit to measure a length. The product between a force and a length is called the Newton-meter (N m) and is used to measure the torque.
The torque, also called the moment, is basically the force that will cause an object to rotate about an axis. Therefore, 1 Nm of torque represents a force of 1 N applied to an object which is 1 m long.
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