Question

why the unit of Torque is Nm and not joule?​

Answer 1

Answer:

Units are defined for "magnitude of a vector", which by itself is a scalar. So, the reason you can't use Joules for torque is because there is no consistent way of converting Newton-meters to Joules and vice versa.

Explanation:

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Answer 2

Units are defined for "magnitude of a vector", which by itself is a scalar. So, the reason you can't use Joules for torque is because there is no consistent way of converting Newton-meters to Joules and vice versa.