Lub attenuation coefficient yog qhov tseeb ntawm kev nthuav tawm coefficient. Nws suav nrog ob ntu: classical absorption thiab molecular absorption. Classical absorption yog vim lub viscosity ntawm huab cua, cov nyhuv ntawm tshav kub conduction, thiab kev sib hloov ntawm huab cua molecules. Nws qhov loj yog proportional rau lub square ntawm lub suab yoj zaus thiab muaj feem xyuam rau huab cua kub thiab cua siab.
