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 Abbreviated list of quantities, units and symbols in physical chemistry

 4.8 physical quantities: radiation

Physical Quantity Symbol SI Unit
radiant energy Q, W J
radiant intensity I, Ie W sr-1, W
emissivity, emittance e 1
absorptance a 1
reflectance r 1
transmittance t 1
absorption coefficient:

-- linear (decadic)

a m-1

-- molar (decadic)

e m2 mol-1
refractive index n 1
molar refraction Rm m3 mol-1
angle of optical rotation a 1, rad


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