# Base unit (measurement)

**base unitbase unitsfundamental quantityFundamental unitfundamental physical quantityfundamental quantitiesfundamental units**

A base unit (also referred to as a fundamental unit) is a unit adopted for measurement of a base quantity.wikipedia

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### Physical quantity

**physical quantitiesquantitiesquantity**

A base quantity is one of a conventionally chosen subset of physical quantities, where no quantity in the subset can be expressed in terms of the others.

Other conventions may have a different number of base units (e.g. the CGS and MKS systems of units).

### Dimensional analysis

**dimensiondimensionsdimensionally equivalent**

These relationships are discussed in dimensional analysis.

A set of base units for a system of measurement is a conventionally chosen set of units, none of which can be expressed as a combination of the others, and in terms of which all the remaining units of the system can be expressed.

### Metre

**metermmetres**

In the International System of Units, there are seven base units: kilogram, metre, candela, second, ampere, kelvin, and mole.

The metre (Commonwealth spelling and BIPM spelling ) or meter (American spelling ) (from the French unit mètre, from the Greek noun μέτρον, "measure") is the base unit of length in the International System of Units (SI).

### Length

**widthlengthsbreadth**

The traditional fundamental dimensions of physical quantity are mass, length, time, charge, and temperature, but in principle, other fundamental quantities could be used.

In most systems of measurement, the unit of length is a base unit, from which other units are derived.

### Natural units

**natural unitGeometric variableshas been set to one**

In theoretical physics it is customary to use such units (natural units) in which c = 1 and ħ = 1.

It is possible to disregard temperature as a fundamental physical quantity, since it states the energy per degree of freedom of a particle, which can be expressed in terms of energy (or mass, length, and time).

### Planck units

**Planck scalePlanck epochPlanck density**

A widely used choice, in particular for theoretical physics, is given by the system of Planck units, which are defined by setting ħ = c = G = k B = k e = 1.

Any system of measurement may be assigned a mutually independent set of base quantities and associated base units, from which all other quantities and units may be derived.

### Unit of measurement

**unitunits of measurementweights and measures**

A base unit (also referred to as a fundamental unit) is a unit adopted for measurement of a base quantity.

### International System of Quantities

**base quantitiesISQbase quantity**

A base unit (also referred to as a fundamental unit) is a unit adopted for measurement of a base quantity.

### Measurement

**measuremeasuringmeasurements**

In the language of measurement, quantities are quantifiable aspects of the world, such as time, distance, velocity, mass, temperature, energy, and weight, and units are used to describe their magnitude or quantity.

### Quantity

**quantitiesquantitativeamount**

In the language of measurement, quantities are quantifiable aspects of the world, such as time, distance, velocity, mass, temperature, energy, and weight, and units are used to describe their magnitude or quantity.

### Time

**temporaldurationsequence of events**

The traditional fundamental dimensions of physical quantity are mass, length, time, charge, and temperature, but in principle, other fundamental quantities could be used. In the language of measurement, quantities are quantifiable aspects of the world, such as time, distance, velocity, mass, temperature, energy, and weight, and units are used to describe their magnitude or quantity.

### Distance

**distancesproximitydepth**

In the language of measurement, quantities are quantifiable aspects of the world, such as time, distance, velocity, mass, temperature, energy, and weight, and units are used to describe their magnitude or quantity.

### Velocity

**velocitiesvelocity vectorlinear velocity**

### Mass

**inertial massgravitational massweight**

The traditional fundamental dimensions of physical quantity are mass, length, time, charge, and temperature, but in principle, other fundamental quantities could be used. In the language of measurement, quantities are quantifiable aspects of the world, such as time, distance, velocity, mass, temperature, energy, and weight, and units are used to describe their magnitude or quantity.

### Temperature

**temperaturesair temperaturewarm**

The traditional fundamental dimensions of physical quantity are mass, length, time, charge, and temperature, but in principle, other fundamental quantities could be used. In the language of measurement, quantities are quantifiable aspects of the world, such as time, distance, velocity, mass, temperature, energy, and weight, and units are used to describe their magnitude or quantity.

### Energy

**energy transferenergiestotal energy**

### Weight

**gross weightweighingweigh**

### SI derived unit

**derived unitderived unitsJ/kg**

Those that can be expressed in this fashion in terms of the base units are called derived units.

### International System of Units

**SISI unitsSI unit**

In the International System of Units, there are seven base units: kilogram, metre, candela, second, ampere, kelvin, and mole.

### Kilogram

**kgmgmilligram**

In the International System of Units, there are seven base units: kilogram, metre, candela, second, ampere, kelvin, and mole.

### Candela

**cdCandelasmegacandela**

### Second

**ssecmegasecond**

### Ampere

**AmAamp**

### Kelvin

**KkelvinsKelvin scale**

### Mole (unit)

**molemolmoles**