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| Description: Density is mass (kg) per unit volume (m3). Due to compressibility, near-surface air is more dense than that above. This may be expressed in terms of the mean free path, or average distance a molecule travels before colliding with another molecule. Picture Stats: Views: 325 Filesize: 29.88kB Height: 297 Width: 240 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=30740 |