# Measurement

measuremeasuringmeasuredmeasurementsmeasurablemensurationmeasuressizemeasurandscale
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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### Metrology

metrologicalmetrologistlegal metrology
The science of measurement is pursued in the field of metrology.
Metrology is the science of measurement.

### Measuring instrument

instrumentscientific instrumentinstruments
The magnitude is the numerical value of the characterization, usually obtained with a suitably chosen measuring instrument.
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

accuracyprecisionaccurate
An uncertainty represents the random and systemic errors of the measurement procedure; it indicates a confidence level in the measurement. Errors are evaluated by methodically repeating measurements and considering the accuracy and precision of the measuring instrument.
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.

### 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.

### Time

temporaldurationintervals
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.

### 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.

### Temperature

temperaturesair temperaturewarm
It is measured with a thermometer calibrated in one or more temperature scales.

### Physical constant

constantconstantsuniversal constant
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.

### Observational error

systematic errormeasurement errorsystematic bias
An uncertainty represents the random and systemic errors of the measurement procedure; it indicates a confidence level in the measurement. Errors are evaluated by methodically repeating measurements and considering the accuracy and precision of the measuring instrument.
Observational error (or measurement error) is the difference between a measured value of a quantity and its true value.

### Length

There are several units that are used to measure length.

### Measurement uncertainty

uncertaintyerroruncertainties
However, the following are just some of the sources of error that arise:
The purpose of measurement is to provide information about a quantity of interest – a measurand.

### Observation

observerobservationsobserved
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

correct for measurement errorcorrected for attenuationcorrected for measurement errors
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. The correction assures that the correlation across data units (for example, people) between two sets of variables is estimated in a manner that accounts for error contained within the measurement of those variables.

### Level of measurement

quantitativescaleinterval scale
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. The measurement of a property may be categorized by the following criteria: type, magnitude, unit, and uncertainty.
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).

### Psychometrics

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

### Order of magnitude

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

### NCSL International

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.

### Timeline of temperature and pressure measurement technology

not a single invention, however, but a developmentabout 1593
Timeline of temperature and pressure measurement technology
Timeline of temperature and pressure measurement technology. A history of temperature measurement and pressure measurement technology.

### Quantification (science)

quantificationquantifyquantitation
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
Timeline of time measurement technology

### Integral linearity

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 measurementunits
The measurement of a property may be categorized by the following criteria: type, magnitude, unit, and uncertainty.
In physics and metrology, units are standards for measurement of physical quantities that need clear definitions to be useful.

### Test method

testingtesttests
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.

### Number sense

numerical intuitionrepresentation of number
Number sense
The term "number sense" involves several concepts of magnitude, ranking, comparison, measurement, rounding, percents, and estimation, including: