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2. Conversion of units - Wikipedia

   en.wikipedia.org/wiki/Conversion_of_units

   Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.

3. List of metric units - Wikipedia

   en.wikipedia.org/wiki/List_of_metric_units

   In addition to the unit one, the SI defines 7 base units and associated symbols: The second (s) is the unit of time. The metre (m) is the unit of length. The kilogram (kg) is the unit of mass. The ampere (A) is the unit of electric current. The kelvin (K) is the unit of thermodynamic temperature. The mole (mol) is the unit of amount of substance.

4. List of obsolete units of measurement - Wikipedia

   en.wikipedia.org/wiki/List_of_obsolete_units_of...

   A U.K. deal equaled 7 ft × 6 ft × 2 + 1 ⁄ 2 in, while a U.S. deal equaled 12 ft × 11 in × 1 + 1 ⁄ 2 in. [7] Demiard – an old French unit of volume . When France metricated , it survived in Louisiana and Quebec .

5. International System of Units - Wikipedia

   en.wikipedia.org/wiki/International_System_of_Units

   The conversion between different SI units for one and the same physical quantity is always through a power of ten. This is why the SI (and metric systems more generally) are called decimal systems of measurement units. [10] The grouping formed by a prefix symbol attached to a unit symbol (e.g. ' km ', ' cm ') constitutes a new inseparable unit ...

6. System of units of measurement - Wikipedia

   en.wikipedia.org/wiki/System_of_units_of_measurement

   A Dictionary of Units of Measurement; Old units of measure; Measures from Antiquity and the Bible Antiquity and the Bible at the Wayback Machine (archived May 10, 2008) Reasonover's Land Measures A Reference to Spanish and French land measures (and their English equivalents with conversion tables) used in North America; The Unified Code for ...

7. Dimensional analysis - Wikipedia

   en.wikipedia.org/wiki/Dimensional_analysis

   Many parameters and measurements in the physical sciences and engineering are expressed as a concrete number—a numerical quantity and a corresponding dimensional unit. Often a quantity is expressed in terms of several other quantities; for example, speed is a combination of length and time, e.g. 60 kilometres per hour or 1.4 kilometres per ...