Quantity dimensions

Secondary quantity Dimension Measuring unit Abbreviation... 

If an equation contains n separate variables and dimensional constants, and these are given dimensional formulas in terms of m primary quantities (dimensions), the number of dimensionless groups in a complete set is (n—m). 

Temperature is a fundamental property in thermodynamics. It is a measure of the kinetic energy of molecules and gives rise the sensation of hot and cold. It is measured using a thermometer, a device that obtains temperature indirectly by measuring some property that is a sensitive function of temperature, for example, the volume of mercury inside a capillary (mercury thermometer), the electric current between two different metallic wires (thermocouple), etc. In the SI system, the absolute temperature is a fundamental quantity (dimension) and its unit is the kelvin (K). In the American Engineering system, absolute temperature is measured in rankine (R), whose relationship to the kelvin is. 

Opening Type Unit Type Quantity Dimensions [ft]... 

The International System of Units (Systeme Internationale d Unites, SI) establishes the standards of comparison used by all countries when the measured values of physical and chemical properties are reported. There are seven SI base quantities (dimensions), for which the defined units of measurement can be combined appropriately to give the SI units for aU other measurable quantities (i.e., the SI system is a coherent system of units). 

Quantity, dimension SI unit Unit (symbol) and exact (E) or rounded conversion factor(s)... 

Physical Quantity (Dimension) Unit Name Unit Abbreviation... 

Quantities, dimensions, units Ont. of product characteristics, eClassOWL Ont. of production processes characteristics, OntoCAPE, ISO 15926 Ont. of production resource characteristics, ManufOnto, CCO, SSN, AutomOnto... 

Physical quantities, dimensions, and units provide auxiliary information for describing aspects of most of the knowledge categories mentioned above, related to temporal aspects, weight, spatial dimensions (e.g., length). Such ontologies can be used to describe the various characteristics of products, production processes, production resources, and production systems. 

For each base quantity, a practical unit of measurement - the so-called base unit - has been defined. Thus, the base unit for length is metre and the base unit for mass is kilogram. The SI unit system is based on the following base system of quantities, dimensions, and units. 

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