Irradiance of a surface for every unit frequency or wavelength. The conditions spectral flux density or even more confusingly "spectral intensity" are utilised. Non-SI units of spectral irradiance involve Jansky = 10 W⋅m⋅Hz and solar flux unit (1SFU = ten W⋅m⋅Hz). In historic India, the Hindu universities of Samkhya https://friedrichh318enw7.mybuzzblog.com/profile