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The joule is defined in the SI system as the work done in moving 1 meter against a force of 1 newton, so yes one newton.meter is one joule. The joule is the fundamental unit of work or energy in the mechanical sense, but it can also be equated with thermal energy via the mechanical equivalent of heat, 1 calorie = 4.1868 joules. From the above mechanical definition, the Joule has dimensions of [M] x [L2] x [T-2], since the Newton as a force has dimensions of [M] x [L] x [T-2]

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Care must be taken not to confuse newton metre in the sense of work (where the force acts in the same direction as the distance travelled) with the newton metre used to measure torque (where the force acts at right angles to a radius of rotation).

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