The best replacement for absorbance is transmittance.

The best alternatives to absorbance are rated as following:

★★★★★	transmittance
★★★★	concentration
★★★★	wavelength
★★★	concentration graph
★★	ph
★★	absorption
★	wavelength graph
★	fluorescence
★	optical density
★	molarity
★	concentration slope
★	transmission
	concentration relationship
	concentration calibration curve
	intensity
	protein concentration
	ph graph
	excitation
	molar absorptivity
	percent transmittance
	emission
	dilution factor
	glucose concentration
	concentration curve
	od

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Speaking about absorbance, one probably shouldn't forget about spectrophotometer.

Other search terms related to absorbance and their ratings are:

★★★★★	spectrophotometer
★★★★	transmittance
★★★★	concentration
★	beer's law
★	extinction coefficient

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absorbance

transmittance

concentration