Examples of SI derived units expressed in terms of base units | ||
---|---|---|

Derived Quantity | SI derived unit | |

area | square metre | m^{2} |

volume | cubic metre | m^{3} |

speed, velocity | metre per second | m/s |

What is the unit of measurement for surface area?

The SI unit of

**area**is square metre ( ). In fact, every unit of length has a corresponding unit of**area**, like square centimetres ( c m 2 ), square millimetres ( m m 2 ), square kilometres ( k m 2 ), square feets ( f t 2 ), square yards ( y d 2 ), square miles ( m i 2 ), etc.1

## What is the SI unit of weight?

The unit of measurement for weight is that of force, which in the International System of Units (SI) is the

**newton**. For example, an object with a mass of one**kilogram**has a weight of about 9.8**newtons**on the surface of the Earth, and about one-sixth as much on the Moon.2

## What is a basic unit?

Any of the

**fundamental units**of length, mass, time, electric current, thermodynamic temperature, amount of substance, or luminous intensity in the International System of**Units**, consisting respectively of the meter, kilogram, second, ampere, kelvin, mole, and candela.3

## What is the unit of time?

The

**base unit**for time is the**second**(the other SI units are: metre for length, kilogram for mass, ampere for electric current, kelvin for temperature, candela for luminous intensity, and mole for the amount of substance).4

## What is the SI unit used to measure distance?

Every system of measures, such as the SI (metric ) system has a standard unit for most measurements. The SI “standard” unit for distance if the

**meter**. In the vLength conversion calculator you will find at least seven SI units of length or distance.5

## What are the base units of the SI system?

**SI Base Units**

- The ampere (A) The ampere is the SI base unit of electrical current.
- The candela (cd) The candela is the SI base unit of luminous intensity.
- The kelvin (K) The kelvin is the SI base unit of thermodynamic temperature.
- The kilogram (kg) The kilogram is the SI base unit of mass.
- The metre (m)
- The mole (mol)
- The second (s)

6

## What is the unit of measure for length?

Recall that the most common metric units of length used are the kilometre (km), the

**metre**(m), the centimetre (cm) and the millimetre (mm).8

## What is the unit for KG S?

m/s or kg. m. s

^{-}^{1}) is the standard unit of momentum . Reduced to base units in the International System of Units ( SI ), a kilogram-**meter**per**second**is the equivalent of a**newton-second**(N.9

## What is the unit for m 2 s 2?

Examples of derived quantities and units

Name | Symbol | Expression in terms of SI base units |
---|---|---|

joule per kilogram | J/kg | m^{2}⋅s^{−}^{2} |

joule per cubic metre | J/m^{3} | m^{−}^{1}⋅kg⋅s^{−}^{2} |

newton per metre | N/m = J/m^{2} | kg⋅s^{−}^{2} |

watt per square metre | W/m^{2} | kg⋅s^{−}^{3} |

10

## What is the unit of an area?

Are, basic unit of area in the metric system, equal to 100

**square**metres and the equivalent of 0.0247 acre. Its multiple, the hectare (equal to 100 ares), is the principal unit of land measurement for most of the world.11

## What is the unit of measurement?

It is also called the

**International System of Units**, or SI. Units of measure in the metric system include: The units of**length**or linear size are based on the**metre**. They include the kilometre (km) which is 1000 meters, the centimetre (cm), and the millimetre (mm) which is 1/1000th of a**meter**.13

## What is the SI unit of length?

The SI unit for length is meters(m), for

**mass**is kilograms(kg), for**volume**is cubic**meter**(m^3), for**density kilogram**per cubic**meter**(kg/m^3), for time is seconds(s), and for temperature is kelvins(K).14

## What is the SI unit of speed?

The SI unit of time is the

**second**. The SI unit of speed and velocity is the ratio of two — the**meter**per**second**. This unit is only rarely used outside scientific and academic circles. Most people on this planet measure speeds in kilometer per hour (km/h or sometimes kph).15

## What are the examples of derived units?

Examples of SI derived units expressed in terms of base units | ||
---|---|---|

Derived Quantity | SI derived unit | |

density, mass density | kilogram per cubic metre | kg/m^{3} |

specific volume | cubic metre per kilogram | m^{3}/kg |

current density | ampere per square metre | A/m^{2} |

16

## What is the SI unit of power?

The dimension of power is energy divided by time. The SI unit of power is the

**watt**(W), which is equal to one**joule per second**.17

## What is the SI unit of volume of a liquid?

The base units of

**length**and volume are linked in the metric system. By definition, a**liter**is equal to the volume of a cube exactly 10 cm tall, 10 cm long, and 10 cm wide. Because the volume of this cube is 1000 cubic centimeters and a**liter**contains 1000 milliliters, 1 milliliter is equivalent to 1 cubic centimeter.18

## What is the unit of mass in the SI unit?

The

**kilogram**is the SI base unit of mass and is equal to the mass of the international prototype of the**kilogram**, a platinum-iridium standard that is kept at the International Bureau of Weights and Measures (**BIPM**) .19

## What is the basic unit of length?

The basic unit of length in the metric system is the

**meter**(m). Common derived units are the**centimeter**(**cm**) (10-2 or 1/100 of a**meter**) and the millimeter (mm) (10-3 or 1/1000 of a**meter**). For measuring large distances, the kilometer (103 or 1000 meters) is often used.