## Measurement Act in Japan

The followings are units which are provided by Measurement Act in Japan.

Quantity of state of physical phenomena |
Measurement Unit |
---|---|

Force | Newton |

Moment of force | Newton meter |

Pressure | Pascal, Newton per square meter, and Bar |

Stress | Pascal, Newton per square meter |

Viscosity | Pascal second, Newton second per square meter |

Force conversion 1kgf=9.80665N

## International System of Units

The SI is founded on seven SI base units for seven base quantities assumed to be mutually independent, as given the followings. Other quantities,

called derived quantities, are defined in terms of the seven base quantities via a system of quantity equations. The SI derived units for these derived

quantities are obtained from these equations and the seven SI base units.

Base quantity | Name | Symbol | Definitions |
---|---|---|---|

Length | meter | m | The meter is the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second. |

Mass | kilogram | kg | The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram. |

Time | second | s | The second is the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom. |

Electric current | ampere | A | The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2×10-7 newton per meter of length. |

Thermodynamic temperature |
kelvin | K | The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. |

Amount of substance |
mole | mol | The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is “mol”. |

Luminous intensity |
candela | cd | The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian. |