# Unit of Torque

azizlwl
Why unit of torque is not m.N

1.Torque=rFSinθ =>m.N
2. 1 N.m = 1 Joule but 1 N.m in torque ≠ 1 Joule

For the above 2 reasons i reckon it should have unit of m.N.

Homework Helper
hi azizlwl!

a Newton-metre and a joule are the same thing

but we tend to use one for torque and the other for energy, to avoid confusion

see http://en.wikipedia.org/wiki/Joule#Confusion_with_Newton_metre
The use of Newton-metres for torque and joules for energy is useful in helping avoid misunderstandings and miscommunications​

(there are other units that describe more than one thing …

for example, the pascal is a unit both of pressure and of energy density )

Gold Member
I read somewhere that we define the unit of torque as N m rather than m N, as the latter makes one want to say 'milli Newton'.