Metrology DEFINITIONS

METROLOGY
1. the science of measurement and calibration
1 METRE
1. Path travelled by light in 1/299792458 seconds (in a vacuum)
2. UNITS
  1. m
1 KILOGRAM
1. Mass of the international prototype of the kilogram
2. UNITS
  1. kg
1 SECOND
1. UNITS
  1. s
2. Duration of 9,192,631,770 periods of transition between two levels of the ground state of the cesium 133 atom
1 AMPERE
1. UNITS
  1. A
2. A constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1m apart in a vacuum, would produce a force of 2x10E-7 N/m between the conductors.
1 KELVIN
1. UNITS
  1. K
2. The fraction 1/273.16 of the thermodynamic pressure of the tripple point of water
1 CANDELA
1. UNITS
  1. cd
2. The luminous intensity of a monochromatic source emitting at 540x10E12 Hz, with a radiant intensity of 1/683 watts per steradian
1 MOLE
1. UNITS
  1. mol
2. The amount of substance of a system which contains as many elementary entities as there are atoms in 0.012kg of carbon-12
MEASUREMENT UNIT SYSTEMS
1. British Imperial System
2. Centimetre-Gram-Second
  1. CGS/cgs
3. Metre-Kilogram-Second
  1. MKS/mks
4. Systeme International d'Unites
  1. SI

Resource summary

	Created by Lydia Barnes over 8 years ago