What is Metrology?

Metrology is the science and process of ensuring that a measurement meets specified degrees of both accuracy and precision.

Importance of Metrology

The importance of metrology system is intuitively felt in all human activity, these systems are needed not only to comply with standard and regulation requirements for a unified international system but also to facilitate world trade and eliminate technical trade barriers. That is why Functioning metrology and quality infrastructure systems are a preconditions for developing countries to be able to cope with the demands not only of developed countries regulations. They are also a precondition to be able to satisfy the demands of consumers which are more and more aware of and interested in issues of quality, but also of productions methods and their implications on the environment and on workers.

Several studies have shown that what is spent on measurement equate 4% to 6% of the national income in the industrial countries; this represents several hundred millions of the European market alone, if we took 3% for the Arabian region, this ratio equate several tenth of million which is more than what Arabian countries budget can withstand


Metrology provides an infrastructure not only for physical and natural sciences but exceeds to comprise environment, medicine, agriculture and food. Various high-level studies demonstrate the impact of measurement to society

The national center of metrology in Jordan contribute effectively and essentially in attracting foreign investments, developing internal investment and eliminating commercial impediments to facilitate trading movements, and improve quality for the Jordanian products, also boosting its competitiveness in the local and international market which mainly will contribute in supporting the national economy through its positive effect in direct and indirect way on the Jordanian citizen and its effect on most sectors, such as scientific metrology (scientific research center, and universities), industrial metrology (all industry), legal metrology such as metering devices concerned with safety and health of individual like for example blood pressure system, clinical thermometer, water, gas, taxi, fuel, and watt-hour meter, pollution meter, radiation meter, electromagnetic waves… etc.

Traceability Chart

In order for JNMI to achieve traceability, it must adjoins one of the national groups that have a direct bond to the BIPM committee. Thus our national center joined the Asia-Pacific group.

This traceability chart shows the position of JNMI with respect to BIPM.



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SI Units

It’s a coherent system of units used for determination of physical quantity, it was officially activated in 1799. This system comprises seven basic units that were derived and verified based on natural phenomena.

The seven basic units are:

  • Length measured in metre (meter): m

  • mass measured in kilogram: kg

  • time measured in second: s

  • electric current measured in ampere: A

  • thermodynamic temperature measured in kelvin: K

  • amount of substance measured in mole: mol

  • luminous intensity measured in candela: cd


The establishment of this system came as a definite result for the need to have better productivity and a unified measuring system to all sector of the society.


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Metrology Terminology

a set of operations that establish under specified conditions the relationship between values of quantities indicated by instrument or measurin system, or values represented by a material measure or a reference material and the corresponding value realized by standards.


(documentation) A document outlining and/or defining requirements and/or conditions, recognized by international agreement to serve as a common basis for evaluation of affected systems, protocols, and/or methods (e.g. ISO 17025). (Measurement) Standard recognized by international agreement to serve internationally as the basis for assigning values to other standards of the quantity concerned (e.g. Meter).


Measurement standard generally having the highest metrological quality available at a given location or in a given organization, from which measurements made there are derived.


Standard that is designated or widely acknowledged as having the highest metrological qualities and whose value is accepted without reference to other standards of the same quantity.




Standard whose value is assigned by comparison with a primary standard of the same quantity.




Standard that is used routinely to calibrate or check material measures, measuring instruments, or reference materials.


Property of the result of a measurement or the value of a standard whereby it can be related to stated references, usually national or international standards, through an unbroken chain of comparisons all having stated uncertainties.




True value of Quantity
Quantity value consistent with the definition of a quantity




Accuracy of Measurement
closeness of agreement between a quantity value obtained by measurement and the true value of the measurand


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