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    How to measure surface area?

    作者:管理員       發布日期: 2015-08-12      點擊: 2852
    When powder surfaces adsorb one monolayer of nitrogen molecules, its specific surface area, Sg, can be derived as follows:

     

           Where  Vm: adsorbed gas volume for one monolayer (ml ) 
                        N:  Avogadro
    s number (6.024×1023
                    :  area occupied by each nitrogen molecule (0.162nm2 )
                    W:  powder weight (g)           
                    noteAt STP, 1 mol gas has a volume of 22.4L or 22400ml  

           Plug in N and to the above equation,we obtain;


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