'Measurement''' is the assignment of a number to a characteristic of an object or event, which can be compared with other objects or events.wikipedia
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metrologicalmetrologistlegal metrology
The science of measurement is pursued in the field of metrology.
Metrology is the science of measurement.

Measuring instrument

instrumentscientific instrumentinstruments
In the physical sciences, quality assurance, and engineering, measurement is the activity of obtaining and comparing physical quantities of real-world objects and events.

Quantitative research

quantitativequantitative methodsquantitative data
Measurement is a cornerstone of trade, science, technology, and quantitative research in many disciplines.
The process of measurement is central to quantitative research because it provides the fundamental connection between empirical observation and mathematical expression of quantitative relationships.

Accuracy and precision

In the fields of science and engineering, the accuracy of a measurement system is the degree of closeness of measurements of a quantity to that quantity's true value.

International System of Units

SISI unitsSI unit
Since the 18th century, developments progressed towards unifying, widely accepted standards that resulted in the modern International System of Units (SI).
The SI is intended to be an evolving system; units and prefixes are created and unit definitions are modified through international agreement as the technology of measurement progresses and the precision of measurements improves.


temporaldurationsequence of events
Time is a component quantity of various measurements used to sequence events, to compare the duration of events or the intervals between them, and to quantify rates of change of quantities in material reality or in the conscious experience.

National Measurement Institute, Australia

National Measurement InstituteNational Measurement Laboratory
In the United Kingdom, the role is performed by the National Physical Laboratory (NPL), in Australia by the National Measurement Institute, in South Africa by the Council for Scientific and Industrial Research and in India the National Physical Laboratory of India.
The National Measurement Institute (NMI) is Australia's peak measurement body responsible for biological, chemical, legal and physical measurement and is currently administered within the Australian Government's Department of Industry, Innovation and Science.


scientificsciencesscientific knowledge
Measurement is a cornerstone of trade, science, technology, and quantitative research in many disciplines.
It is also used extensively in observing and collecting measurements.


temperaturesair temperaturewarm
Temperature is measured with a thermometer.


There are several units that are used to measure length.

Observational error

systematic errormeasurement errorsystematic bias
As all other measurements, measurement in survey research is also vulnerable to measurement error, i.e. the departure from the true value of the measurement and the value provided using the measurement instrument.
Observational error (or measurement error) is the difference between a measured value of a quantity and its true value.

Physical constant

constantconstantsfundamental constants
Artifact-free definitions fix measurements at an exact value related to a physical constant or other invariable phenomena in nature, in contrast to standard artifacts which are subject to deterioration or destruction.
By definition, fundamental physical constants are subject to measurement, so that their being constant (independent on both the time and position of the performance of the measurement) is necessarily an experimental result and subject to verification.

Measurement uncertainty

uncertaintyerrormeasurement uncertainties
The purpose of measurement is to provide information about a quantity of interest – a measurand.


In science, an empirical relationship is a relationship or correlation based solely on observation rather than theory.
Observations can be qualitative, that is, only the absence or presence of a property is noted, or quantitative if a numerical value is attached to the observed phenomenon by counting or measuring.

Correction for attenuation

corrected for attenuationcorrect correlation coefficients for measurement errorcorrect for measurement error
In order to get accurate results, when measurement errors appear, the results need to be corrected for measurement errors.
In measurement and statistics, the correction is also called disattenuation.

Level of measurement

quantitativelevels of measurementscale
In the natural sciences and engineering, measurements do not apply to nominal properties of objects or events, which is consistent with the guidelines of the International vocabulary of metrology published by the International Bureau of Weights and Measures.
In that article, Stevens claimed that all measurement in science was conducted using four different types of scales that he called "nominal", "ordinal", "interval", and "ratio", unifying both "qualitative" (which are described by his "nominal" type) and "quantitative" (to a different degree, all the rest of his scales).


psychometricpsychometricianpsychometric tests
Psychometrics is a field of study concerned with the theory and technique of psychological measurement.

NCSL International

NCSL International (NCSLI) (from the founding name "National Conference of Standards Laboratories") is a global, non-profit organization whose membership is open to any organization with an interest in metrology (the science of measurement) and its application in research, development, education, and commerce.

Order of magnitude

orders of magnitudeorderon the order of
Differences in order of magnitude can be measured on a base-10 logarithmic scale in “decades” (i.e., factors of ten).

Timeline of temperature and pressure measurement technology

not a single invention, however, but a development1593
Timeline of temperature and pressure measurement technology.

Quantification (science)

In mathematics and empirical science, quantification (or quantitation) is the act of counting and measuring that maps human sense observations and experiences into quantities.

Timeline of time measurement technology

measurement of timeThe Measurement of Time
Timeline of time measurement technology

Integral linearity

A measurement system consists of a sensor, to input the physical parameter that is of interest, and an output to a medium that is suitable for reading by the system that needs to know the value of the parameter.

Unit of measurement

unitunits of measurementweights and measures
Units of measurement are generally defined on a scientific basis, overseen by governmental or independent agencies, and established in international treaties, pre-eminent of which is the General Conference on Weights and Measures (CGPM), established in 1875 by the Metre Convention, overseeing the International System of Units (SI) and having custody of the International Prototype Kilogram.
In physics and metrology, units are standards for measurement of physical quantities that need clear definitions to be useful.

Test method

In software development, engineering, science, manufacturing, and business, its developers, researchers, manufacturers, and related personnel must understand and agree upon methods of obtaining data and making measurements.