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TeachMeFinance.com - explain optical thickness (optical depth) optical thickness (optical depth) The term 'optical thickness (optical depth)' as it applies to the area of carbon dioxide can be defined as ' In calculating the transfer of radiant energy, the mass of an absorbing or emitting material lying in a vertical column of unit cross-sectional area and extending between two specified levels. Also, the degree to which a cloud prevents light from passing through it; the optical thickness then depends on the physical constitution (crystals, drops, and/or droplets), the form, the concentration, and the vertical extent of the cloud'. The term 'optical thickness (optical depth)' as it applies to the area of Earth observation can be defined as ' In calculating the transfer of radiant energy, the mass of an absorbing or emitting material lying in a vertical column of unit cross-sectional area and extending between two specified levels. Also, the degree to which a cloud prevents light from passing through it; the optical thickness then depends on the physical constitution (crystals, drops, and/or droplets), the form, the concentration, and the vertical extent of the cloud'. Previous 5 Terms: opisometer opisthosomal opposing winds OPRG opsiometer Next 5 Terms: Optical Transient Detector (OTD) optics optimate Optimum moisture content, or Optimum water content Option premium, futures About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.