# Measurement(मोजमापन)-mpsc science

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### Table Of Contain-Measurement(मोजमापन)

## Intro of Measurement(मोजमापन)

➤It is need to have a specific Quantity of that matter to measure it correctly and that standard is called as UNIt.

➤Matter,things and substances are measured by various type of concept

➤ CGS Unit- centimeter Gram second Unit

➤ FPS Unit-Foot,Pound,Second

➤ MKS Unit-Meter,Kilogram,Second

➤ SI Unit-International Unit -in 1790 French created this measurement standards

➤There are two more types of unit

## Fundamental Units

➤ A base unit is a unit adopted for measurement of a base quantity. 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

➤There are 7 fundamental units.

physical quantity | unit | abbreviation |
---|---|---|

mass | kilogram | kg |

length | meter | m |

time | second | s |

temperature | Kelvin | K |

amount of substance | mole | mol |

electric current | ampere | A |

luminous intensity | candela | cd |

## Derived Unit

➤This Units are derived from fundamental units

Parameter | SI Unit | Abbreviation | Definition |
---|---|---|---|

Frequency | hertz | Hz | 1/s |

Force | newton | N | kg*m/s² |

Pressure | pascal | Pa | N/m² |

Work or Energy | joule | J | N*m |

Power | watt | W | J/s |

Electric Potential | volt | V | W/A |

Electric Resistance | ohm | ohm | V/A |

Quantity of Charge | coulomb | C | A*s |

Electric Capacitance | farad | F | C/V |

Conductance | siemens | S | A/V |

Magnetic Flux | weber | Wb | V*s |

Magnetic Flux Density | tesla | T | Wb/² |

Inductance | henry | H | Wb/A |

Celsius Temperature | degree | °C | K |

Luminous Flux | lumen | lm | cd*sr |

Illuminance | lux | lx | lm/m² |

Activity | becquerel | Bq | 1/s |

Absorbed Dose | gray | Gy | J/kg |

Dose Equivalent | sievert | Sv | m²/s² |

## Scalar Quantity

➤ The physical quantities which are specified with the magnitude or size alone are scalar quantities.

➤ For example, length, speed, work, mass, density, etc.

## Vector Quantity

➤ Vector quantities refer to the physical quantities characterized by the presence of both magnitude as well as direction.

➤For example, displacement, force, torque, momentum, acceleration, velocity, etc.

## Difference between Scalar And Vector

Criteria |
Scalar |
Vector |

Definition | A scalar is a quantity with magnitude only. | A vector is a quantity with the magnitude as well as direction. |

Direction | No direction | Yes there is the direction |

Specified by | A number (Magnitude) and a Unit | A number (magnitude), direction and a unit. |

Represented by | Quantity symbol | Quantity symbol in bold or an arrow sign above |

Example | Mass and Temperature | Velocity and Acceleration |

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