Speed
Distance per unit time. SI: metre per second (m/s).
所有Speed單位（6）
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Frequently Asked Questions
What is the SI base unit of speed?
The SI base speed unit is m/s. Most conversions factor through it, except temperature which is affine and fuel-economy which is reciprocal.
Which unit systems are represented?
Speed includes both metric and imperial units (where they exist in this category). For mass and length, both metric (kg, m) and US customary (lb, ft) are listed. For temperature, the three most-common scales (Celsius, Fahrenheit, Kelvin) plus Rankine and Réaumur.
How accurate are these conversions?
Conversions use the standard SI factors (NIST values where applicable). Where two slightly different definitions exist (e.g. KB vs KiB, US vs UK gallon), they are listed as separate units rather than auto-rounded.
其他分類
Distance, height, width — anything that measures how long something is. SI base unit: the metre (m).
#2How much matter is in something. Differs from weight (which is force). SI base: kilogram (kg).
#3How hot or cold something is. Conversions are affine — there is an offset, not just a multiplier.
#4Size of a 2-D surface. SI base: square metre (m²).
#5Space occupied by a 3-D object. SI base: litre (L) for everyday use; cubic metre (m³) for SI.
#6Duration. SI base: the second (s).
#7Digital information size. SI: the byte (B). Note the difference between decimal (KB=1000) and binary…
#8Capacity to do work. SI base: joule (J). Also commonly expressed as calories, kWh, BTU.
#9Force per unit area. SI base: pascal (Pa).
#10Rotation or turning. SI base: radian (rad).
#11Distance per unit of fuel, or its reciprocal (fuel per distance). Base: litres per 100 km.