# Metre–tonne–second system of units

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For a topical guide to this subject, see Outline of the metric system.

The **metre–tonne–second** or **MTS** system of units is a system of physical units. It was invented in France, hence the unit names *sthène* and *pièze*, and became its legal system between 1919 and 1961 ("décret" 5 May 1961, "Journal Officiel"). It was adopted by the Soviet Union in 1933 and abolished there in 1955. It was a metric and coherent system of units, much as SI and the centimetre-gram-second system (CGS), but with larger units for industrial use, whereas the CGS system was regarded as suitable for laboratory use only.^{[1]}^{[2]}

## Units

The base units of the MTS system are as follows:

- length: metre
- volume: cubic metre or litre

- 1 m
^{3}≡ 1 kL

- 1 t = 10
^{3}kg = 1 Mg

- 1 sn = 1 t·m/s
^{2}= 10^{3}N = 1 kN

- 1 sn·m = 1 t·m
^{2}/s^{2}= 10^{3}J = 1 kJ

- 1 sn·m/s = 1 t·m
^{2}/s^{3}= 10^{3}W = 1 kW

## See also

- Metre-kilogram-second system of units (MKS)
- Foot-pound-second system of units (FPS)
- Quadrant-eleventh-gram-second system (QES)

## References

- ↑ "System of Measurement Units".
*IEEE Global History Network*. Institute of Electrical and Electronics Engineers (IEEE). Retrieved 2011-03-21. - ↑ "Notions de physique - Systèmes d'unités" [Symbols used in physics - units of measure] (in French). Hydrelect.info. Retrieved 2011-03-21.