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Physical properties of the tiny scale structures in the cold neutral medium(CNM) of galaxies is a long-standing puzzle. Only a few lines of sights in ourGalaxy have been studies with mixed results on the scale-invariant propertiesof such structures. Moreover, since these studies measure the variation ofneutral hydrogen optical depth, they do not directly constrain the densitystructures. In this letter, we investigate the possibility of measuring theproperties of density and spin temperature structures of the \HI fromabsorption studies of \HI. Our calculations show that irrespective of thethermal properties of the clouds, the scale structure of the \HI column densitycan be estimated, whereas, \HI absorption studies alone cannot shed much lighton either the amplitude of the density fluctuations and their temperaturestructures. Detailed methodology and calculations with some fiducial examplesare presented.

HI column density statistics of the cold neutral medium from absorption studies