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# What is meant by base and derived units?

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## Related Questions

###### Asked in Physics

### What are the fundamental and derived units?

In a system of units such as the SI, BASE UNITS are defined;
other units are derived from those.For example, in the SI, the
meter, the kilogram, and the second are base units; the units for
area (meters squared), for speed and velocity (meters/second), etc.
are derived from the base units.
Which units are base units, and which units are derived units,
really depends on how the unit is defined. For example, in the SI,
pressure is a derived unit; but you can just as well invent a
system in which pressure is a base unit, and some other units, that
are base units in the SI, are derived in this new system.

###### Asked in Physics, Engineering

### What is the difference between a fundamental unit and a derived unit?

In a system of unites such as the SI, some units are defined as
base units. Other units are defined based on those other units -
i.e., as combinations of several of the other units. For example,
if a meter is a (base) unit of length and a second the(base) unit
of time, a square meter is a (derived) unit of area, and is simply
defined as a meter times a meter; while a meter/second is the
(derived) unit for speed. In summary, derived units are
combinations of base units (or other derived units); base units are
not.

###### Asked in Physics

### What are differentiate fundamental units to derived units?

The derived unit is from a combination of fundamental units. A
fundamental unit is a centimeter. A derived unit is a cubic
centimeter, or a cube that is a centimeter on each side. Derived
units are mainly used for measuring liquids
Answer
The correct term is 'base unit', NOT 'fundamental unit'. There
are seven base units: metre, kilogram, second, ampere, kelvin,
candela, and mole. ALL other units are called 'derived units'. For
example, the unit of electrical charge, the 'coulomb' is a derived
unit which equates to the base units 'ampere second'.

###### Asked in Physics

### What is the relationship between SI base units and derived units?

Derived units are units built up from SI base units. It has been
found that relatively few base units are required.
Typical derived units are m/sec (metres per second), sometimes
written m.sec-1 for speed and joules/sec, sometimes written
joules.sec-1 for power. Although the latter unit is a derived unit,
it has its own name, the watt, for convenience. (Nonetheless, the
people who govern the business of defining units have been
scrupulous in defining it in terms of base units because it's
possible.) New base units are defined when phenomena are
encountered which simply cannot be measured in terms of existing
base units or units derived from them.

###### Asked in Physics, Units of Measure, Earth Sciences

### What is the difference between derived quantities and fundamental quantities?

In the SI system, there are two categories of
unit: the Base Unit and the Derived Unit. There is no
such category as 'fundamental unit'.
There are seven Base Units. These are: the metre,
kilogram, second, ampere, kelvin, candela, and mole.
All other units are Derived Units, and these are
combinations of Base Units, sometimes given special names. For
example, the coulomb is a Derived Unit, and is equivalent to an
ampere second, which are both Base Units..

###### Asked in Physics, Science Experiments

### Why are derived units more complex than fundamental units and why is it important to know whether a unit is derived or fundamental?

Derived units are simply more complex because they are made up
of several (that is, usually, by more than one) base unit. It is
just the way they are defined; for example, in the SI, distance and
time are base units, while speed is a derived unit (distance /
time). You can just as well invent a system of units where - for
example - time and speed are base units; in this case, distance
would be a derived unit.

###### Asked in Math and Arithmetic, Units of Measure

### How many units are in the SI system and can i see them?

The SI has 7 base units:
http://en.wikipedia.org/wiki/SI_base_unit
Also, the SI has tens of derived units - perhaps hundreds of
them, since you can combine the base units in many ways. Those
units are ultimately derived from the 7 base units. For example,
units for area, volume, speed, force, energy, pressure, electric
charge, voltage, and many more, are derived from some of the base
units. http://en.wikipedia.org/wiki/SI_derived_unit

###### Asked in Math and Arithmetic, Units of Measure, Metric System

### What are the basic quantities of metric system and their base units?

Units in the metric, or SI, system are dived into two types;
base units and derived units. Base units are defined in terms of a
physical constant, and derived units are produced by combinations
of the base units.
The seven base units are;
Length, metres.
Mass, kilogram.
Time, second.
Temperature, kelvin.
Electric current, ampere.
Amount of substance, mole.
Luminous intensity, candela.

###### Asked in Math and Arithmetic

### How many SI units?

###### Asked in Units of Measure, Physics

### What are the fundamental and derived SI units?

There are several SI base units, and many more derived units,
which are combinations of other units. For example, meter and
second are base units, meter/second (for speed or velocity) is a
derived unit. For more details, see these links:
http://en.wikipedia.org/wiki/SI_base_unit
http://en.wikipedia.org/wiki/SI_derived_unit

###### Asked in Units of Measure

### What do derived units look like?

Derived units do not have a single 'look'. They are produced
from the base units of a measuring system such as the SI
system.
In the SI system there are seven base units which are;
Metre
Kilogram
Second
Ampere
Kelvin
Mole
Candela
All other units are DERIVED units.
For example the units for volume is the cubic metre and density
is derived from the metre and kilogram. So density is kilograms per
cubic metre in the SI system.