Is it required to learn these definitions of base units? 

Is it required to learn these definitions of base units?  mlandty eth Electric current _Arnour1t of substance in LeasiLy kllcg•am se-cond ampere Table 2.1 kg cd Sr Base gunntitles and Units* metre is the length of the path trHve11ed bv light In vacuum during a time interval of of a second. (1983) me kilogram Is equal to the mass of the tnt«natlonal prototype of the kilogram (H plHtinum-ifidt11m alloy cylinder) kept at international Bureau of Weights and Measures, at Sevres, near Paris. France. ( 1889) The second Ls the duration of g, 192,631,770 periods of the radiation corresponding to the transition Ext'.veen the two hyperfine levels or Lhe ground sLaLe of the cesium-133 alum. (1967) me ampere is that constant current which, if maintained in two straight parallel conductors of Inftnlte length. ofnegllglble circular cross-section, and placed 1 metre apHrt in vacuum, would produce between these conductors a equal to & 1 (Y' newton 11teLre of length. [1948) The kehhn. is the fraction 1/273.16 of the thermodynamic temperature of the tliple point of water. (1967) The mole is the amount of of a system, which contains as many elementary- entities as there alæ atoms in 0.012 kllogram of carbon - 12. (1971) 'Ihe candela is the Luminous intensity, in a *ven direction, of a source that eliliLs Inunuchrunalic radiaüun of frequfflcy 540x1012 hertz and that has a radtant Lntenstty tn that direction of 1/683 watt per steradian. ( 1979) The values mentioned here need not be remembered or asked in a test. Tzey are given here only to indicate the