[PAR] [TLE] Coherence (units of measurement) [SEP] A coherent derived unit is defined as a derived unit that, for a given system of quantities and for a chosen set of base units, is a product of powers of base units with no other proportionality factor than one.  The concept of coherence was developed in the mid-nineteenth century by, amongst others, Kelvin and James Clerk Maxwell and promoted by the British Association for the Advancement of Science.  The concept was initially applied to the centimetre–gram–second (CGS) and the foot–pound–second systems (FPS) of units in 1873 and 1875 respectively.  The International System of Units (1960) was designed around the system of coherence. [PAR] [TLE] James Clerk Maxwell [SEP] James Clerk Maxwell {'1': ", '2': ", '3': ", '4': "} (13 June 1831 – 5 November 1879) was a Scottish scientist in the field of mathematical physics.  His most notable achievement was to formulate the classical theory of electromagnetic radiation, bringing together for the first time electricity, magnetism, and light as manifestations of the same phenomenon.  Maxwell's equations for electromagnetism have been called the "second great unification in physics" after the first one realised by Isaac Newton.
[PAR] [TLE] Coherence ( units of measurement ) [ SEP ] A coherent derived unit is defined as a derived unit that , for a given system of quantities and for a chosen set of base units , is a product of powers of base units with no other proportionality factor than one . The concept of coherence was developed in the mid - nineteenth century by , amongst others , Kelvin and James Clerk Maxwell and promoted by the British Association for the Advancement of Science . The concept was initially applied to the centimetre – gram – second ( CGS ) and the foot – pound – second systems ( FPS ) of units in 1873 and 1875 respectively . The International System of Units ( 1960 ) was designed around the system of coherence . [PAR] [TLE] James Clerk Maxwell [ SEP ] James Clerk Maxwell { ' 1 ' : " , ' 2 ' : " , ' 3 ' : " , ' 4 ' : " } ( 13 June 1831 – 5 November 1879 ) was a Scottish scientist in the field of mathematical physics . His most notable achievement was to formulate the classical theory of electromagnetic radiation , bringing together for the first time electricity , magnetism , and light as manifestations of the same phenomenon . Maxwell 's equations for electromagnetism have been called the " second great unification in physics " after the first one realised by Isaac Newton .
What is an achievement of James Clerk Maxwell, a Scottish scientist who helped to develop the concept of coherence?
What is an achievement of James Clerk Maxwell , a Scottish scientist who helped to develop the concept of coherence ?
classical theory of electromagnetic radiation
classical theory of electromagnetic radiation