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What is the difference between Nm and mN?

Answer
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Hint: The units are the main measuring things to find the quantity of any object or source. They may be milli, mega, gega and kg. The measuring units may vary according to the situation.

Complete answer:
The Nm is the Newton meter which is used to measure the torque of an object. The torque is defined as the force required to rotate a body. It is the product of the force and the distance between the force and the center of the body that is experiencing force.
So the units are calculated as Nm (force-N and length between the force and the center of body-m)
The force is the push or pull on an object; it is calculated in Newton in the S.I. system, kg/$m^2$ in the M.K.S system. mN is the milli-newton that means 1000th part of the newton (if the unit is 1 newton then the mN is 0.001N).
Therefore, the difference between both is the Nm is the units of torque and the mN is the units of the force.

Note:
The units of the both torque and the force consists of Newton but the difference lies in the defining. Be sure the torques is also a type of force but it is responsible for the rotation of the body but the force is push or pull that acts on a body, the result of force will be in any direction. The small m is the milli and the capital M is the Mega.