# Measurement FAQs:

Q: Is a measurement the assignment of a number to a characteristic of an object or event?

A: Yes, and which can be compared with other objects or events.

Q: Is a measurement pursued in the field of metrology?

A: Yes.

Q: Are measurements achieved by simply moving the decimal place: 1.234 metres is 1234 millimetres or 0.001234 kilometres?

A: Yes.

Q: Is a measurement originally developed to prevent fraud in commerce?

A: Yes.

Q: Is a measurement a cornerstone of trade?

A: Yes, and science, technology, and quantitative research in many disciplines.

Q: Is a measurement derived from historical agreements?

A: Yes.

Q: Are measurements uncertain?

A: Yes, so instead of assigning one value, a range of values is assigned to a measurement.

Q: Is a measurement dependent on the context and discipline?

A: Yes.

Q: Is a measurement defined as "the correlation of numbers with entities that are not numbers"?

A: Yes, The most technically elaborated form of representational theory is also known as additive conjoint measurement.

Q: Is a measurement : "A set of observations that reduce uncertainty where the result is expressed as a quantity"?

A: Yes.

Q: Is a measurement performed?

A: Yes, and the wavefunction of the quantum system "collapses" to a single, definite value.

Q: Is a measurement generally defined on a scientific basis?

A: Yes, and overseen by governmental or independent agencies, and established in international treaties, pre-eminent of which is the General Conference on Weights and Measures , established in 1875 by the Metre Convention, overseeing the International System of Units and having custody of the International Prototype Kilogram.

Q: Is a measurement a taxonomy for the methodological character of a comparison?

A: Yes.

A: Yes, and a quantum system is simultaneously described by all values in a spectrum, or range, of possible values, where the probability of measuring each value is determined by the wavefunction of the system.

Q: Is a measurement not exact?

A: Yes, but only precise to two significant digits.

Q: Is a measurement an action that determines a particular property of a quantum system?

A: Yes.

Q: Is a measurement often misunderstood as merely the assignment of a value?

A: Yes, but it is possible to assign a value in a way that is not a measurement in terms of the requirements of additive conjoint measurement.

Q: Is a measurement essential in many fields?

A: Yes, and since all measurements are necessarily approximations, a great deal of effort must be taken to make measurements as accurate as possible.

Q: Is a measurement the determination or estimation of ratios of quantities?

A: Yes.

Q: Is a measurement mutually defined: quantitative attributes are those possible to measure?

A: Yes, and at least in principle.