# A question of absorption coefficient units

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 August 2, 2011, 04:17 A question of absorption coefficient units #1 New Member   Join Date: Jan 2011 Posts: 5 Rep Power: 8 Recently, I work on how to calculate the radiation by finite volume method. In this method, an absorption coefficient is needed. I got the absorption coefficient from NASA-SP-3080.But the unit of absorbtion coeficient is inverse centimeter(1/cm).My question is : if I want to use it in meter unit system, the unit of absorbtion coeficient (1/cm) should be change to inverse meter(1/m)? That mean the absorption coefficient(1/m) is the product of 100 times absorption coefficient (1/cm) from NASA-SP-3080? Thank you in advance.

August 4, 2011, 02:45
#2
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Rami Ben-Zvi
Join Date: Mar 2009
Posts: 148
Rep Power: 10
Quote:
 Originally Posted by ljwbuaa Recently, I work on how to calculate the radiation by finite volume method. In this method, an absorption coefficient is needed. I got the absorption coefficient from NASA-SP-3080.But the unit of absorbtion coeficient is inverse centimeter(1/cm).My question is : if I want to use it in meter unit system, the unit of absorbtion coeficient (1/cm) should be change to inverse meter(1/m)? That mean the absorption coefficient(1/m) is the product of 100 times absorption coefficient (1/cm) from NASA-SP-3080? Thank you in advance.
That's right: an absorption coefficient of 1/cm, say, = 100/m. This can easily be understood, since the power absorbed crossing 100 cm is 100 larger than for 1cm.

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