Final answer:
In chemistry, absorbance readings can be used to measure the concentration of a substance in a sample. The Beer-Lambert law is commonly used for this purpose.
Step-by-step explanation:
In chemistry, the concentration of a substance in a sample can be measured using absorbance readings. Absorbance is a measure of the amount of light absorbed by a substance and is related to its concentration. The Beer-Lambert law is commonly used to calculate the concentration of a substance based on its absorbance. In the context of the provided information, the concentration of proteins in a sample can be measured using absorbance readings from a chemical assay. The more protein present, the higher the absorbance reading.