Familles d'unités

UnitCloud est un laboratoire de mesure local pour le quotidien, la technique, l'informatique, l'énergie, la mobilité et le design.

Longueur

Inch, foot and mile use fixed factors. Errors usually come from early rounding or from mixing land miles and nautical miles.

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Unité de base: m
Valeurs cibles: 11
Unit: nm, µm, mm, cm, m, km

Surface

Area scales quadratically. A length factor is not automatically an area factor.

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Unité de base: m²
Valeurs cibles: 8
Unit: mm², cm², m², km², ha, acre

Volume

Volume is robust for liquids. For dry ingredients it does not replace weighing because density and packing vary.

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Unité de base: l
Valeurs cibles: 11
Unit: ml, cl, dl, l, m³, tsp

Masse

Pound is not always the same local unit. UnitCloud uses international avoirdupois values.

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Unité de base: g
Valeurs cibles: 8
Unit: µg, mg, g, kg, t, oz

Température

Temperature uses an offset. Fahrenheit and Kelvin are not pure factor units.

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Unité de base: °C
Valeurs cibles: 4
Unit: °C, °F, K, °R

Données

KB, MB and GB are decimal. KiB, MiB and GiB are binary. This distinction explains many apparent storage gaps.

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Unité de base: Byte
Valeurs cibles: 10
Unit: bit, B, KB, MB, GB, TB

Vitesse

Knots are nautical miles per hour. mph and knots are not interchangeable imperial speeds.

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Unité de base: m/s
Valeurs cibles: 5
Unit: m/s, km/h, mph, kn, ft/s

Énergie

Food calories are kilocalories. Utility bills use kilowatt-hours. Both are energy units, but in different contexts.

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Unité de base: J
Valeurs cibles: 8
Unit: J, kJ, Wh, kWh, cal, kcal

Puissance

PS and hp are not identical. Vehicle data often uses metric horsepower, while US/UK contexts often use mechanical horsepower.

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Unité de base: W
Valeurs cibles: 6
Unit: W, kW, MW, PS, hp, BTU/h

Pression

bar, psi and atm appear in different fields. Tyre, weather and lab values need context.

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Unité de base: Pa
Valeurs cibles: 8
Unit: Pa, kPa, MPa, bar, mbar, psi

Densité

Density depends on temperature, material state and measurement conditions. Unit conversion does not replace material data.

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Unité de base: kg/m³
Valeurs cibles: 4
Unit: kg/m³, g/cm³, g/l, lb/ft³

Temps

Calendar months and years vary. This family uses fixed seconds for technical durations, not legal deadlines.

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Unité de base: s
Valeurs cibles: 7
Unit: ms, s, min, h, d, week

Angle

Degrees and radians are often mixed in software, geometry and trigonometry. Formulas usually expect a specific angle unit.

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Unité de base: rad
Valeurs cibles: 6
Unit: rad, °, gon, turn, ′, ″

Force

Force and mass are not the same. Kilogram is mass, newton is force.

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Unité de base: N
Valeurs cibles: 5
Unit: N, kN, MN, lbf, kgf

Couple

Torque is not power. Newton metre and hp/kW answer different questions.

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Unité de base: N·m
Valeurs cibles: 4
Unit: N·m, lb·ft, lb·in, kgf·m

Consommation

mpg and l/100 km move in opposite directions. Higher mpg means lower consumption; higher l/100 km means higher consumption.

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Unité de base: l/100 km
Valeurs cibles: 4
Unit: l/100 km, km/l, mpg US, mpg imp

Typographie

px depends on output context. UnitCloud uses the CSS reference of 96 px per inch.

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Unité de base: pt
Valeurs cibles: 6
Unit: pt, pc, in, mm, cm, px

Résolution d'image

Pixel count and print density are different. Print sizes also need width, height and ppi.

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Unité de base: px
Valeurs cibles: 4
Unit: px, kpx, MP, GP

Fréquence

rpm and bpm are events per minute. Hz is events per second.

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Unité de base: Hz
Valeurs cibles: 6
Unit: Hz, kHz, MHz, GHz, rpm, bpm