kilogram-meter
C1Technical/Scientific
Definition
Meaning
A unit of torque or moment in the metric system, representing the force of one kilogram acting at a perpendicular distance of one meter from a pivot point.
A precise measure of rotational force (torque) used in physics and engineering, often abbreviated as kg·m. In some contexts, especially older texts, it can ambiguously refer to a unit of energy or work (the kilogram-force meter), but the modern standard for torque distinguishes it clearly from the joule.
Linguistics
Semantic Notes
Strictly a unit of measurement for torque (moment of force). Its symbol is kg·m or kg m. It is not a unit of energy (work), which would be the kilogram-force meter (kgf·m), a non-SI unit. Context is crucial to avoid confusion.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or grammatical differences. Both use the same term. The preference for SI units is universal in scientific contexts, though the newton-meter (N·m) is more common globally.
Connotations
Neutral and technical in both regions. May be perceived as slightly dated or less common than the newton-meter.
Frequency
Extremely low frequency in general language. Used almost exclusively in specialized physics, mechanical engineering, and torque wrench specifications. Slightly more likely to appear in older British engineering texts.
Vocabulary
Collocations
Grammar
Valency Patterns
[torque] + [be] + [number] + kilogram-metersapply/require + [number] + kilogram-meters[verb] + at + [number] + kilogram-metersVocabulary
Synonyms
Strong
Neutral
Weak
Usage
Context Usage
Business
Rare. Might appear in technical specifications for imported machinery or component datasheets.
Academic
Used in physics and engineering textbooks, particularly when discussing classical mechanics and rotational dynamics, often in contrast to imperial units like foot-pounds.
Everyday
Virtually never used. An everyday speaker would not encounter this term.
Technical
Primary domain. Used in mechanical engineering, automotive repair (torque settings), physics problem sets, and technical manuals for equipment calibration.
Examples
By CEFR Level
- The bolt needs a force of ten kilogram-meters to be tight enough.
- The engine produces a maximum torque of 25 kilogram-meters at 4,000 RPM.
- You must calibrate the tool to apply exactly 15 kg·m.
- The discrepancy arose from conflating the kilogram-meter of torque with the kilogram-force meter of energy, a common pedagogical pitfall.
- According to the schematic, the coupling should be torqued to 120 ± 5 kilogram-meters using a calibrated wrench.
Learning
Memory Aids
Mnemonic
Imagine a one-kilogram weight at the end of a one-meter-long wrench: that's the torque you're applying—a kilogram-meter.
Conceptual Metaphor
TORQUE IS TWISTING FORCE AT A DISTANCE.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'килограмм-метр' used for work/energy (кгс·м). In modern scientific Russian, 'ньютон-метр' (N·m) is standard for torque, similar to English.
- The hyphen in English is often replaced by a center dot (·) or a space in writing: kg·m.
- The word order is fixed: 'kilogram-meter', not 'meter-kilogram'.
Common Mistakes
- Using it to describe energy or work (should be joule).
- Omitting the hyphen and writing as one word ('kilogrammeter').
- Confusing it with 'kilogram per meter' (kg/m), a different unit.
- Pronouncing it as a run-on without a slight pause between the two units.
Practice
Quiz
What does 'kilogram-meter' specifically measure?
FAQ
Frequently Asked Questions
Not exactly. 1 kilogram-meter (kgf·m) is approximately 9.80665 newton-meters (N·m). The newton-meter is the standard SI unit for torque.
Historically and informally, yes (as kilogram-force meter), but this is non-SI and can cause confusion. The modern, unambiguous unit for energy is the joule (1 kgf·m ≈ 9.80665 J).
In older engineering textbooks, some mechanical tool specifications (especially from certain regions), and physics problems contrasting metric and imperial units (e.g., vs. foot-pounds).
With a hyphen: 'kilogram-meter'. In symbolic form, it is written as 'kg·m' or 'kg m' to denote multiplication, not division.