absorbance
Absorbance refers to the ratio of the intensity of the incident light before the light passes through the solution or substance to the intensity of the transmitted light after the light passes through the solution or a substance (I0/I1) based on the logarithm of 10 (ie lg(I0/I1)) , Where I0 is the intensity of incident light, and I1 is the intensity of transmitted light. The factors that affect it are solvent, concentration, temperature, and so on.