(9) Internal Revenue Code means the Internal Revenue Code of 1986 in effect for the federal tax year beginning on January 1, 2007, not including any changes made by federal law after that date, and any regulations adopted under that code applicable to that period.
Absorbance is the negative logarithm of the percent transmittance divided by 100. A spectrophotometer can be set to measure either the percent transmittance or the absorbance of a solution. In lab, you will be using a spectrophotometer called the Spectronic 20 or Spec 20 to measure absorbance.
A method which measures the ability of particlesâsolutesâin a solution to absorb light over a range of wavelengths. Mechanism Because each compound absorbs light differently, absorption spectra are compound-specific and can be used to measure solute and solvent concentrations and determine reaction rates.