# System of measurement

system of unitssystems of measurementmeasurement systemSystemssystems of unitsmeasurement systemsancient weights and measuresmetrictraditional systems of measurementancient
A system of measurement is a collection of units of measurement and rules relating them to each other.wikipedia
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### Metric system

metricmetric unitsmetric unit
Systems of measurement in modern use include the metric system, the imperial system, and United States customary units.
The metric system is an internationally recognised decimalised system of measurement.

### Length

In most systems, length (distance), mass, and time are base quantities.
In most systems of measurement, the unit of length is a base unit, from which other units are derived.

### Yard

yardsReceiving yardsyd
The yard (abbreviation: yd) is an English unit of length, in both the British imperial and US customary systems of measurement, that comprises 3 feet or 36 inches.

### Inch

ininchesinternational inch
Historically a wide range of units was used for the same type of quantity: in different contexts, length was measured in inches, feet, yards, fathoms, rods, chains, furlongs, miles, nautical miles, stadia, leagues, with conversion factors which were not powers of ten.
The inch (abbreviation: in or ″) is a unit of length in the (British) imperial and United States customary systems of measurement.

### International System of Units

SISI unitsSI unit
Some other standard non-SI units are still in international use, such as nautical miles and knots in aviation and shipping. The current international standard metric system is the International System of Units (Système international d'unités or SI) It is an mks system based on the metre, kilogram and second as well as the kelvin, ampere, candela, and mole.
The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.

### MKS system of units

MKSMKS systemmeter–kilogram–second
These include gravitational systems, the centimetre–gram–second systems (cgs) useful in science, the metre–tonne–second system (mts) once used in the USSR and the metre–kilogram–second system (mks).
The MKS system of units is a physical system of measurement that uses the metre, kilogram, and second (MKS) as base units.

### Imperial units

imperialimperial systemimperial unit
Systems of measurement in modern use include the metric system, the imperial system, and United States customary units.
The system of imperial units or the imperial system (also known as British Imperial or Exchequer Standards of 1825) is the system of units first defined in the British Weights and Measures Act of 1824, which was later refined and reduced.

### Avoirdupois system

avoirdupoislbavoirdupois ounce
The Avoirdupois units of mass and weight differ for units larger than a pound (lb).
The avoirdupois system (abbreviated avdp) is a measurement system of weights which uses pounds and ounces as units.

### Comparison of the imperial and US customary measurement systems

U.S. Survey Milediffer between the American and imperial systemsdifferences between the systems
While imperial and US customary systems are closely related, there are a number of differences between them.
Both the imperial and United States customary systems of measurement derive from earlier English systems used in the Middle Ages, that were the result of a combination of the local Anglo-Saxon units inherited from German tribes and Roman units brought by William the Conqueror after the Norman Conquest of England in 1066.

### Pound (mass)

lbpoundspound
The Avoirdupois units of mass and weight differ for units larger than a pound (lb).
used in the imperial, United States customary and other systems of measurement.

### Natural units

naturalnatural unitGeometric variables
Natural units are physical units of measurement defined in terms of universal physical constants in such a manner that selected physical constants take on the numerical value of one when expressed in terms of those units.
A purely natural system of units has all of its units defined in this way, and usually such that the numerical values of the selected physical constants in terms of these units are exactly dimensionless

### Atomic units

atomic unita.u.atomic field
Atomic units are a system of units used in atomic physics, particularly for describing the properties of electrons. The atomic units have been chosen such that several the constants relating to the electron are all equal to one. They are similar to "Schrödinger" units but set the electron mass to unity and allow the gravitational constant to float. The unit of energy in this system is the total energy of the electron in the Bohr atom and called the Hartree energy. The unit of length is the Bohr radius.
Atomic units (au or a.u.) form a system of natural units which is especially convenient for atomic physics calculations.

### List of unusual units of measurement

football fieldfull-lengthDog year
Non-standard measurement units, sometimes found in books, newspapers etc., include:
An unusual unit of measurement is a unit of measurement that does not form part of a coherent system of measurement; especially in that its exact quantity may not be well known or that it may be an inconvenient multiple or fraction of base units in such systems.

### Second

ssecmegasecond
The current international standard metric system is the International System of Units (Système international d'unités or SI) It is an mks system based on the metre, kilogram and second as well as the kelvin, ampere, candela, and mole.
In 1832, Gauss proposed using the second as the base unit of time in his millimeter-milligram-second system of units.

### Japanese units of measurement

Japanesechōri
Japanese
Traditional Japanese units of measurement or the shakkanhō (undefined, "shaku–kan system") is the traditional system of measurement used by the people of the Japanese archipelago.

### Biblical and Talmudic units of measurement

kavbathHebrew
Hebrew (Biblical and Talmudic)
While documentation on each units' relation another's is plentiful, there is much debate, both within Judaism and in academia, about the exact relationship between measurements in the system and those in other measurement systems.

### Cubit

cubitsroyal cubitcubit arm
Eventually cubits and strides gave way to "customary units" to meet the needs of merchants and scientists.
System of measurement

### United States customary units

USUS customaryU.S. customary
Systems of measurement in modern use include the metric system, the imperial system, and United States customary units.
History of measurement, systems, and units of measurement

### Mesures usuelles

French'' feetmetric systemPied
Mesures usuelles (French for customary measurements) were a system of measurement introduced as a compromise between the metric system and traditional measurements.
Systems of measurement

### Old Irish units of measurement

Irishpenny
Irish
Early Irish law texts record a wide variety of units of measurement, organised into various systems.

### Ton

tonstdisplacement ton
The imperial system uses a stone of 14 lb, a long hundredweight of 112 lb and a long ton of 2240 lb. The stone is not used in the US and the hundredweights and tons are short: 100 lb and 2000 lb respectively.
Systems of measurement

### Foot (unit)

feetftfoot
Historically a wide range of units was used for the same type of quantity: in different contexts, length was measured in inches, feet, yards, fathoms, rods, chains, furlongs, miles, nautical miles, stadia, leagues, with conversion factors which were not powers of ten.
Systems of measurement

### Medieval weights and measures

Medieval weights and measures
The following systems arose from earlier systems, and in many cases utilise parts of much older systems.

### Luxembourgian units of measurement

Luxembourgian
Luxembourgian
Metric System has been compulsory as the system of measurement in Luxembourg since 1820.

### Unit of measurement

unitunits of measurementunits
Natural units are physical units of measurement defined in terms of universal physical constants in such a manner that selected physical constants take on the numerical value of one when expressed in terms of those units. A system of measurement is a collection of units of measurement and rules relating them to each other.
A multitude of systems of units used to be very common.