Understanding IR Spectrum: The Role of Transmittance and Absorption

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The discussion centers on the relationship between transmittance and absorption in IR spectroscopy, specifically regarding the intensity of absorption peaks. The % transmittance indicates the amount of infrared light that passes through a sample, while % absorption represents the light absorbed by the sample. Despite having more C-H bonds, the C=O bond exhibits higher absorption intensity due to its stronger dipole moment and greater polarizability, making it more effective at absorbing IR radiation. This highlights the importance of molecular structure and bond characteristics in determining absorption intensity. Understanding these concepts is crucial for interpreting IR spectra accurately.
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In the above diagram, what does the % of transmittance means?
I know the % of transmittance is the reverse of % absorption, but there are more C-H bond per molecule than C=O, why the intensity for C=O is higher(higher absorption)? I really have no clues!
 
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can anyone explain??
 

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