In psychology, social inertia describes a person's resistance to change. In economics, inertia has two meanings, the tendency of an economy to continue moving in a fixed direction until a sufficient force acts to change that direction, and the "unwillingness to change" at a large firm which may contribute to a diseconomy of scale. In physics, inertia is a historical concept and a perceived property of matter that eventually was developed by Isaac Newton to explain the default state of matter in terms of bod ...

Including:

Inertia - History
Inertia - Historical timeline
Inertia - Newtonian mechanics
Inertia - Mass as a measure of inertia Inertia - 'Inertial' mass Inertia - 'Inertial' frames
Inertia - Rotational inertia Inertia - Books and papers

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Because measurement involves the estimation of magnitudes of quantities relative to particular quantities, called units, the specification of units is of fundamental importance to measurement. The definition or specification of precise standards of measurement involves two key features, which are evident in the Système International d'Unités (SI). Specifically, in this system the definition of each of the base units makes reference to specific empirical conditions and, with the exception of the kilogram, also to other quantitative a ...

See also:

Measurement, Measurement - Units and systems of measurement, Measurement - Metrology, Measurement - History, Measurement - Difficulties in measurement, Measurement - Miscellaneous

Read more here: » Measurement: Encyclopedia II - Measurement - Units and systems of measurement

The Lebesgue measure on Rn has the following properties: If A is a cartesian product of intervals I1 × I2 × ... × In, then A is Lebesgue measurable and Here, |I| denotes the length of the interval I. If A is a disjoint union of finitely many or countably many disjoint Lebesgue measurable sets, then A is itself Lebesgue measurable and λ(A) is equal to the sum (or infinite series) of ...

See also:

Lebesgue measure, Lebesgue measure - Examples, Lebesgue measure - Properties, Lebesgue measure - Null sets, Lebesgue measure - Construction of the Lebesgue measure, Lebesgue measure - Relation to other measures, Lebesgue measure - History

Read more here: » Lebesgue measure: Encyclopedia II - Lebesgue measure - Properties

Units of measurement - Units as dimensions. Any value of a physical quantity is expressed as a comparison to a unit of that quantity. For example, the value of a physical quantity Q is written as the product of a unit [Q] and a numerical factor: The multiplication sign is usually left out, just as it is left out between variables in scientific notation of formulas. In formulas the unit [Q] can be treated as if it was a kind of physical ...

See also:

Units of measurement, Units of measurement - Introduction, Units of measurement - History, Units of measurement - Systems of measurement, Units of measurement - Base and derived units, Units of measurement - Calculations with units, Units of measurement - Units as dimensions, Units of measurement - Guidelines, Units of measurement - Expressing a physical value in terms of another unit

Read more here: » Units of measurement: Encyclopedia II - Units of measurement - Calculations with units

Cubit - The Sumerian Nippur cubit and the Egyptian royal cubit. The cubit is among the first recorded units of length used by an ancient people. The Egyptian royal cubit: It has been securely estabished from surviving architectural evidence that a standard measure was employed as early as c. 2750 BC (Dynasty III) at Saqqara (J.P.Lauer). From the evidence this is widely accepted to have been 523.5 to 524 mm (20.61 to 20.63 in) in length, and was subdivided int ...

See also:

Cubit, Cubit - History of the different cubits, Cubit - The Sumerian Nippur cubit and the Egyptian royal cubit, Cubit - Other important cubits

Read more here: » Cubit: Encyclopedia II - Cubit - History of the different cubits

The metric system was officially adopted in France after the French Revolution. During the history of the metric system a number of variations have evolved and their use spread around the world replacing many traditional measurement systems. By the end of World War II a number of different systems of measurement were still in use throughout the world. Some of these systems were metric system variations whilst others were based on the Imperial and American systems. It was recognised that additional steps were needed to promote a worldw ...

See also:

SI, SI - History, SI - Units, SI - SI writing style, SI - Spelling variations, SI - Cultural issues

Read more here: » SI: Encyclopedia II - SI - History

Measuring the ratios between physical quantities is an important sub-field of physics. Some important physical quantities include: Speed of light Planck's constant Gravitational constant Elementary charge (electric charge of electrons, protons, etc.) Fine-structure constant ...

See also:

Measurement, Measurement - Units and systems of measurement, Measurement - Metrology, Measurement - History, Measurement - Difficulties in measurement, Measurement - Miscellaneous

Read more here: » Measurement: Encyclopedia II - Measurement - Miscellaneous

Measurement of many quantities is very difficult and prone to large error. Part of the difficulty is due to uncertainty, and part of it is due to the limited time available in which to make the measurement. Examples of things that are very difficult to measure in some respects and for some purposes include social related items such as: A person's knowledge (as in testing, see also assessment) A person's feelings, emot ...

See also:

Measurement, Measurement - Units and systems of measurement, Measurement - Metrology, Measurement - History, Measurement - Difficulties in measurement, Measurement - Miscellaneous

Read more here: » Measurement: Encyclopedia II - Measurement - Difficulties in measurement

The amount of beauty that can launch one thousand ships. Usually used as the millihelen, the amount of beauty that can launch one ship. Named after Helen of Troy, from the Iliad. Inspired by Marlowe's line from the play The Tragical History of Doctor Faustus, "Was this the face that launched a thousand ships...?". Negative values have also been observed - these, of course, are measured by the number of ships sunk. Microhelens are, as one-tenth of the beauty required to motivate one sailor, sometimes given ...

See also:

List of strange units of measurement, List of strange units of measurement - Attoparsec, List of strange units of measurement - Barn-megaparsec, List of strange units of measurement - Belgium, List of strange units of measurement - Books and Bible, List of strange units of measurement - Cigarette, List of strange units of measurement - Coffee, List of strange units of measurement - Cut-lunch-and-a-water-bag, List of strange units of measurement - Distance, List of strange units of measurement - Double-decker bus, List of strange units of measurement - FFF, List of strange units of measurement - FFF Base units, List of strange units of measurement - FFF derived units, List of strange units of measurement - Football field, List of strange units of measurement - Gillette, List of strange units of measurement - Happy, List of strange units of measurement - Helen, List of strange units of measurement - Hobo Power, List of strange units of measurement - Jiffy, List of strange units of measurement - KLOC or K-LOC, List of strange units of measurement - Koskenkorva bottle, List of strange units of measurement - Library of Congress, List of strange units of measurement - Metric, List of strange units of measurement - Microbit, List of strange units of measurement - Mikrotuki, List of strange units of measurement - Morgan, List of strange units of measurement - Nanoacre, List of strange units of measurement - Nanocentury, List of strange units of measurement - Nanosecond, List of strange units of measurement - Nelson's Column / Double-decker Bus, List of strange units of measurement - Nibble, List of strange units of measurement - Pikotuki, List of strange units of measurement - Pinkwater, List of strange units of measurement - Poronkusema, List of strange units of measurement - Potrzebie, List of strange units of measurement - Realtor's Throw, List of strange units of measurement - Rhode Island/Texas/Alaska/Washington D.C., List of strange units of measurement - Rods to the Hogshead, List of strange units of measurement - Seemeilen/Woche, List of strange units of measurement - SI-Imperial hybrids, List of strange units of measurement - Siriometer, List of strange units of measurement - Smoot, List of strange units of measurement - Stone's throw/Spitting distance, List of strange units of measurement - Sydharb, List of strange units of measurement - Tall Buildings, List of strange units of measurement - Wales/Belgium, List of strange units of measurement - Warhol

Read more here: » List of strange units of measurement: Encyclopedia II - List of strange units of measurement - Helen

The amount of beauty that can launch one thousand ships. Usually used as the millihelen, the amount of beauty that can launch one ship. Named after Helen of Troy, from the Iliad. Inspired by Marlowe's line from the play The Tragical History of Doctor Faustus, "Was this the face that launched a thousand ships...?". Negative values have also been observed - these, of course, are measured by the number of ships sunk. ...

See also:

List of strange units of measurement, List of strange units of measurement - Attoparsec, List of strange units of measurement - Barn-megaparsec, List of strange units of measurement - Belgium, List of strange units of measurement - Books and Bible, List of strange units of measurement - Coffee, List of strange units of measurement - Cut-lunch-and-a-water-bag, List of strange units of measurement - Distance, List of strange units of measurement - Double-decker bus, List of strange units of measurement - FFF, List of strange units of measurement - FFF Base units, List of strange units of measurement - FFF derived units, List of strange units of measurement - Football field, List of strange units of measurement - Gillette, List of strange units of measurement - Happy, List of strange units of measurement - Helen, List of strange units of measurement - Hobo Power, List of strange units of measurement - Jiffy, List of strange units of measurement - KLOC or K-LOC, List of strange units of measurement - Koskenkorva bottle, List of strange units of measurement - Library of Congress, List of strange units of measurement - Metric, List of strange units of measurement - Microbit, List of strange units of measurement - Mikrotuki, List of strange units of measurement - Morgan, List of strange units of measurement - Nanoacre, List of strange units of measurement - Nanocentury, List of strange units of measurement - Nanosecond, List of strange units of measurement - Nelson's Column / Double-decker Bus, List of strange units of measurement - Nibble, List of strange units of measurement - Pikotuki, List of strange units of measurement - Pinkwater, List of strange units of measurement - Poronkusema, List of strange units of measurement - Potrzebie, List of strange units of measurement - Realtor's Throw, List of strange units of measurement - Rhode Island/Texas/Alaska/Washington D.C., List of strange units of measurement - Rods to the Hogshead, List of strange units of measurement - Seemeilen/Woche, List of strange units of measurement - SI-Imperial hybrids, List of strange units of measurement - Siriometer, List of strange units of measurement - Smoot, List of strange units of measurement - Stone's throw/Spitting distance, List of strange units of measurement - Sydharb, List of strange units of measurement - Tall Buildings, List of strange units of measurement - Wales/Belgium, List of strange units of measurement - Warhol

Read more here: » List of strange units of measurement: Encyclopedia II - List of strange units of measurement - Helen

The amount of beauty that can launch one thousand ships. Usually used as the millihelen, the amount of beauty that can launch one ship. Named after Helen of Troy, from the Iliad. Inspired by Marlowe's line from the play The Tragical History of Doctor Faustus, "Was this the face that launched a thousand ships...?". See also: millihelens.com Negative values have also been observed ...

See also:

List of strange units of measurement, List of strange units of measurement - Attoparsec, List of strange units of measurement - Barn-megaparsec, List of strange units of measurement - Belgium, List of strange units of measurement - Books and Bible, List of strange units of measurement - Coffee, List of strange units of measurement - Cut-lunch-and-a-water-bag, List of strange units of measurement - Distance, List of strange units of measurement - FFF, List of strange units of measurement - FFF Base units, List of strange units of measurement - FFF derived units, List of strange units of measurement - Football field, List of strange units of measurement - Gillette, List of strange units of measurement - Helen, List of strange units of measurement - Hobo Power, List of strange units of measurement - Jiffy, List of strange units of measurement - KLOC or K-LOC, List of strange units of measurement - Koskenkorva bottle, List of strange units of measurement - Library of Congress, List of strange units of measurement - Metric, List of strange units of measurement - Microbit, List of strange units of measurement - Mikrotuki, List of strange units of measurement - Morgan, List of strange units of measurement - Nanoacre, List of strange units of measurement - Nanocentury, List of strange units of measurement - Nanosecond, List of strange units of measurement - Nelson's Column / Double-decker Bus, List of strange units of measurement - Nibble, List of strange units of measurement - Pikotuki, List of strange units of measurement - Pinkwater, List of strange units of measurement - Poronkusema, List of strange units of measurement - Potrzebie, List of strange units of measurement - Realtor's Throw, List of strange units of measurement - Rhode Island/Texas/Alaska/Washington D.C., List of strange units of measurement - Rods to the Hogshead, List of strange units of measurement - Seemeilen/Woche, List of strange units of measurement - SI-Imperial hybrids, List of strange units of measurement - Smoot, List of strange units of measurement - Stone's throw/Spitting distance, List of strange units of measurement - Sydharb, List of strange units of measurement - Tall Buildings, List of strange units of measurement - Wales/Belgium, List of strange units of measurement - Warhol

Read more here: » List of strange units of measurement: Encyclopedia II - List of strange units of measurement - Helen

The definition, agreement and practical use of units of measurement have played a crucial role in human endeavour from early ages up to this day. Disparate systems of measurement used to be very common. Now there is a global standard, the International System (SI) of units, a form of metric system. The SI has been or is in the process of being adopted throughout the world. The United States of America is almost certainly the last to adopt the ...

See also:

Units of measurement, Units of measurement - Introduction, Units of measurement - History, Units of measurement - Systems of measurement, Units of measurement - Base and derived units, Units of measurement - Calculations with units, Units of measurement - Units as dimensions, Units of measurement - Guidelines, Units of measurement - Expressing a physical value in terms of another unit

Read more here: » Units of measurement: Encyclopedia II - Units of measurement - Introduction

Different systems of units are based on different choices of a set of fundamental units. The most widely used system of units is the International System of Units, or SI. There are seven SI base units. All other SI units can be derived from these base units. For most quantities a unit is absolutely necessary to communicate values of that physical quantity. For example, conveying to someone a particular length without using some sort of unit is impossible, because a length cannot be descr ...

See also:

Units of measurement, Units of measurement - Introduction, Units of measurement - History, Units of measurement - Systems of measurement, Units of measurement - Base and derived units, Units of measurement - Calculations with units, Units of measurement - Units as dimensions, Units of measurement - Guidelines, Units of measurement - Expressing a physical value in terms of another unit

Read more here: » Units of measurement: Encyclopedia II - Units of measurement - Base and derived units

A number of metric systems of units have evolved since the adoption of the original metric system in France in 1791. The current international standard metric system is the International system of units. Prior to the global adoption of the metric system many different systems of measurement had been in use. Many of these were related to some extent or other. Often they were based on the dimensions of the human body. Both the Imperial units and US customary units derive from earlier English units. Imperial units were mostly used ...

See also:

Units of measurement, Units of measurement - Introduction, Units of measurement - History, Units of measurement - Systems of measurement, Units of measurement - Base and derived units, Units of measurement - Calculations with units, Units of measurement - Units as dimensions, Units of measurement - Guidelines, Units of measurement - Expressing a physical value in terms of another unit

Read more here: » Units of measurement: Encyclopedia II - Units of measurement - Systems of measurement

A subset of Rn is a null set if, for every ε > 0, it can be covered with countably many products of n intervals whose total volume is at most ε. All countable sets are null sets, and so are sets in Rn whose dimension is smaller than n, for instance straight lines or circles in R2. In order to show that a given set A is Lebesgue measurable, one usually tries to find a "nicer" set B which differs from A only by a nul ...

See also:

Lebesgue measure, Lebesgue measure - Examples, Lebesgue measure - Properties, Lebesgue measure - Null sets, Lebesgue measure - Construction of the Lebesgue measure, Lebesgue measure - Relation to other measures, Lebesgue measure - History

Read more here: » Lebesgue measure: Encyclopedia II - Lebesgue measure - Null sets

An instrument used to measure gravity is known as a gravimeter, or gravitometer. Since general relativity regards the effects of gravity as indistinguishable from the effects of acceleration, gravimeters may be regarded as special purpose accelerometers. Many weighing scales may be regarded as simple gravimeters. In one common form, a spring is used to counteract the force of gravity pulling on an object. The change in length of the spring may be calibrated to the force required to balance the gravitational pull. The resulting measurement may be made in units of force (such as th ...

See also:

Gravimetry, Gravimetry - Units of measurement, Gravimetry - How gravity is measured, Gravimetry - History

Read more here: » Gravimetry: Encyclopedia II - Gravimetry - How gravity is measured

The modern gravimeter was developed by Lucien LaCoste and Arnold Romberg in 1936. They also invented most subsequent refinements, including the ship-mounted gravimeter, in 1965, temperature-resistant instruments for deep boreholes, and lightweight hand-carried instruments. Most of their designs remain in use (2005) with refinements in data collection and data processing. ...

See also:

Gravimetry, Gravimetry - Units of measurement, Gravimetry - How gravity is measured, Gravimetry - History

Read more here: » Gravimetry: Encyclopedia II - Gravimetry - History

There are two commonly used measures of fitness; absolute fitness and relative fitness. Absolute fitness (wabs) is defined for a given genotype for one generation as the ratio of organisms with that genotype after selection to those before. It may be calculated from absolute numbers or from frequencies, and as a ratio, is a value between 0 and 1. Relative fitness is quantified as the average number of surviving progeny of a particular genotype com ...

See also:

Fitness biology, Fitness biology - Measures of fitness, Fitness biology - Discussion, Fitness biology - History

Read more here: » Fitness biology: Encyclopedia II - Fitness biology - Measures of fitness

An individual's fitness is manifested through its phenotype. As phenotype is affected by both genes and environment, the fitnesses of different individuals with same genotype are not necessarily equal, but depend on the environment in which the individuals live. As fitness measures the quantity of the copies of the genes of an individual in the next generation, it doesn't really matter how the genes arrive in the next generation. That is, for an individual it is equally beneficial to reproduce itself, or to help relatives with ...

See also:

Fitness biology, Fitness biology - Measures of fitness, Fitness biology - Discussion, Fitness biology - History

Read more here: » Fitness biology: Encyclopedia II - Fitness biology - Discussion

The relative atomic mass is measured with a mass spectrometer. After placing a sample of the element to be measured in the mass spectrometer it is bombarded with electrons which turns the atoms into positive ions. An electric field is then used to accelerate these positive ions, after which the ions are deflected using a magnetic field. As a result the various isotopes are separated out due to the ions of lighter isotopes being deflected more than those heavier. This produces a mass spectrum. This spectrum provides two things: Relative iso ...

See also:

Atomic mass unit, Atomic mass unit - Measuring relative atomic masses, Atomic mass unit - History

Read more here: » Atomic mass unit: Encyclopedia II - Atomic mass unit - Measuring relative atomic masses

Glucose levels are measured in either: 1. Milligrams per deciliter (mg/dL), in the United States and other countries (Myanmar, Liberia) that do not yet use the International or "Metric" System of measurement; or, 2. Millimoles per liter (mmol/L) in the rest of the "metrified world." Comparatively: 72 mg/dL = 4 mmol/L 90 mg/dL = 5 mmol/L 108 mg/dL = ...

See also:

Hyperglycemia, Hyperglycemia - Causes, Hyperglycemia - Diabetes, Hyperglycemia - Non-diabetic hyperglycemia, Hyperglycemia - History, Hyperglycemia - Measurement, Hyperglycemia - Common Symptoms of Diabetic Hyperglycemia

Read more here: » Hyperglycemia: Encyclopedia II - Hyperglycemia - Measurement