| Newton-metre | |
|---|---|
 One newton-metre is the torque resulting from a force of one newton applied perpendicularly to the end of a moment arm that is one metre long. | |
| General information | |
| Unit system | SI |
| Unit of | torque |
| Symbol | N⋅m, N m |
| Conversions | |
| 1 N⋅min ... | ... is equal to ... |
| FPS system | 0.73756215lbf.ft |
| inch⋅pound-force | 8.8507 in lbf |
| inch⋅ounce-force | 141.6 in oz |
Thenewton-metre ornewton-meter (also non-hyphenated,newton metre ornewton meter; symbolN⋅m[1] orN m[1])[a] is the unit oftorque (also calledmoment) in theInternational System of Units (SI). One newton-metre is equal to the torque resulting from aforce of onenewton applied perpendicularly to the end of amoment arm that is onemetre long.
The unit is also used less commonly as a unit ofwork, orenergy, in which case it is equivalent to the more common and standard SI unit of energy, thejoule.[2] In this usage the metre term represents the distance travelled or displacementin the direction of the force, and not theperpendicular distance from a fulcrum (i.e. the lever arm length) as it does when used to express torque. This usage is generally discouraged,[3] since it can lead to confusion as to whether a given quantity expressed in newton-metres is a torque or a quantity of energy.[4] "Even though torque has the same dimension as energy (SI unit joule), the joule is never used for expressing torque".[4]
Newton-metres and joules aredimensionally equivalent in the sense that they have the same expression inSI base units,
but are distinguished in terms of applicablekind of quantity, to avoid misunderstandings when a torque is mistaken for an energy or vice versa. Similar examples of dimensionally equivalent units includePa versus J/m3,Bq versusHz, andohm versusohm per square.
