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2. List of unusual units of measurement - Wikipedia

   en.wikipedia.org/wiki/List_of_unusual_units_of...

   Horizontal pitch (HP) is a unit of length defined by the Eurocard printed circuit board standard used to measure the horizontal width of rack mounted electronic equipment, similar to the rack unit (U) used to measure vertical heights of rack mounted equipment. One HP is 0.2 inches (1/5") or 5.08 millimetres wide.

3. History of measurement - Wikipedia

   en.wikipedia.org/wiki/History_of_measurement

   Detail of a cubit rod in the Museo Egizio of Turin The earliest recorded systems of weights and measures originate in the 3rd or 4th millennium BC. Even the very earliest civilizations needed measurement for purposes of agriculture, construction and trade. Early standard units might only have applied to a single community or small region, with every area developing its own standards for ...

4. United States customary units - Wikipedia

   en.wikipedia.org/wiki/United_States_customary_units

   Length. For measuring length, the U.S. customary system uses the inch, foot, yard, and mile, which are the only four customary length measurements in everyday use. From 1893, the foot was legally defined as exactly 1200⁄3937 m (approximately 0.304 8006 m). [13] Since July 1, 1959, the units of length have been defined on the basis of 1 yd = 0 ...

5. International System of Units - Wikipedia

   en.wikipedia.org/wiki/International_System_of_Units

   mole. amount of substance. cd. candela. luminous intensity. The SI comprises a coherent system of units of measurement starting with seven base units, which are the second (symbol s, the unit of time), metre (m, length), kilogram (kg, mass), ampere (A, electric current), kelvin (K, thermodynamic temperature), mole (mol, amount of substance ...

6. System of units of measurement - Wikipedia

   en.wikipedia.org/wiki/System_of_units_of_measurement

   A system of units of measurement, also known as a system of units or system of measurement, is a collection of units of measurement and rules relating them to each other. Systems of measurement have historically been important, regulated and defined for the purposes of science and commerce. Instances in use include the International System of ...

7. List of obsolete units of measurement - Wikipedia

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

   Corgee – an obsolete unit of mass equal to 212 moodahs, or rush mat bundles of rice. The unit was used in the Canara (now Kanara) region of Karnataka in India. Cullingey. Dharni. Dirham. Duella. Dutch cask – a British unit of mass, used for butter and cheese. Equal to 112 lb (51 kg). Esterling.