the movement of molecules of a particular substance from regions of high concentration to regions of low concentration of that substance, i.e. down a CONCENTRATION GRADIENT. The rate of diffusion in gases is much greater than in liquids, due to differences in their molecular structure.
1990 Score Supplemental Emmitt Smith rookie card. This is Emmitt Smithâs best rookie card. You can find these football cards on Ebay in Gem MT 10 condition for about $300-$350. These cards are condition sensitive due to the colored border. A great card and a great investment.
Todayâs Value: $2,500. 1952 Topps Mickey Mantle â OK, this is not his true rookie card. But itâs pursued like it is his rookie card because itâs his first Topps card. For collectors who have tried to build a run of Topps sets over the years and/or a collection of Mantleâs Topps cards, this is the starting point. The 1952 Topps set is most desired, collected and valuable card set in history.