Physical World and Measurement Archives

Amount of subtance containing the same number of particles as there are atoms in 0.012 kg of carbon 12

7 years ago

Source which emits radiation of frequency 540 x 10² Hz with radiant intensity of 1/683 watt per steradian

7 years ago

Current between two straight parallel conductors separated 1m apart which generates 2 x 10⁻⁷ N/m

7 years ago

1 / 273.16 of thermodynamic temperature at triple point of water

7 years ago

9.2 Billion vibrations of transition between two level of cesium-133 atom in ground state

7 years ago

Mass of platinum iridium cylinder kept in International Bureau of weights in paris, France

7 years ago

1.65Million wavelength of orange red coloured radation emitted by krypton 86

7 years ago

Relative error expressed in percentage

7 years ago

Ratio of error observed in the measurement to the actual value

7 years ago

Difference in actual value and the measured value

7 years ago